Rules for Combining I/O Standards in the Same Bank

The following rules must be obeyed to combine different input, output, and bidirectional standards in the same bank:

1. Combining output standards only. Output standards with the same output V _CCO requirement can be combined in the same bank.

Compatible example:

SSTL15_I and LVDCI_15 outputs

Incompatible example:

SSTL15 (output V _CCO = 1.5V) and LVCMOS18 (output V _CCO = 1.8V) outputs

Only two true differential output I/O standards can be combined in HR I/O banks. LVDS_25 with LVDS_PRE_EMPHASIS = FALSE (default) and LVDS_25 with LVDS_PRE_EMPHASIS = TRUE are considered as two different true-differential output standards in HR I/O banks.

Only one true differential output I/O standard can be used in HP I/O banks. LVDS with LVDS_PRE_EMPHASIS = FALSE (default) and LVDS with LVDS_PRE_EMPHASIS = TRUE are considered as two different true-differential output standards and cannot be combined within the same HP I/O bank.

2. Combining input standards only. Input standards with the same V _CCO and V _REF requirements can be combined in the same bank.

Compatible example:

LVCMOS15 and HSTL_II inputs

Incompatible example:

LVCMOS15 (input V _CCO = 1.5V) and LVCMOS18 (input V _CCO = 1.8V) inputs

Incompatible example:

HSTL_I_DCI_18 (V _REF = 0.9V) and HSTL_I_DCI (V _REF = 0.75V) inputs

3. Combining input standards and output standards. Input standards and output standards with the same V _CCO requirement can be combined in the same bank.

Compatible example:

LVDS_25 output and LVCMOS25 input

Incompatible example:

LVDS_25 output (output V _CCO = 2.5V) and HSTL_I input (input V _CCO = 1.5V)

4. Combining bidirectional standards with input or output standards. When combining bidirectional I/O with other standards, make sure the bidirectional standard can meet the first three rules.

The implementation tools enforce these design rules.

Table: VCCO and VREF Requirements for Each Supported I/O Standard , summarizes the V _CCO and V _REF requirements for each supported I/O standard. For more detailed DC specifications, including the recommended operating ranges of the supplies for each supported I/O standard, see the specific UltraScale device data sheet [Ref 2] .

Table 1-77: V _CCO and V _REF Requirements for Each Supported I/O Standard
I/O Standard	I/O Bank Availability	V _CCO (V)			V _REF (V)
I/O Standard	I/O Bank Availability	Output	Input	Input with DIFF_TERM_ADV and DIFF_TERM Support	Input
LVTTL	HR	3.3	3.3	N/A	N/A
LVCMOS33	HR	3.3	3.3	N/A	N/A
LVCMOS25	HR	2.5	2.5	N/A	N/A
LVCMOS18	Both	1.8	1.8	N/A	N/A
LVCMOS15	Both	1.5	1.5	N/A	N/A
LVCMOS12	Both	1.2	1.2	N/A	N/A
HSUL_12	Both	1.2	1.2	N/A	0.60
LVDCI_18	HP	1.8	1.8	N/A	N/A
LVDCI_15	HP	1.5	1.5	N/A	N/A
HSUL_12_DCI	HP	1.2	1.2	N/A	0.60
HSLVDCI_18	HP	1.8	1.8	N/A	0.90
HSLVDCI_15	HP	1.5	1.5	N/A	0.75
HSTL_I	Both	1.5	1.5	N/A	0.75
HSTL_II	HR	1.5	1.5	N/A	0.75
HSTL_I_DCI	HP	1.5	1.5	N/A	0.75
HSTL_I_18	Both	1.8	1.8	N/A	0.90
HSTL_II_18	HR	1.8	1.8	N/A	0.90
HSTL_I_DCI_18	HP	1.8	1.8	N/A	0.90
HSTL_I_12	HP	1.2	1.2	N/A	0.60
HSTL_I_DCI_12	HP	1.2	1.2	N/A	0.60
SSTL18_I	Both	1.8	1.8	N/A	0.90
SSTL18_II	HR	1.8	1.8	N/A	0.90
SSTL15	Both	1.5	1.5	N/A	0.75
SSTL15_R	HR	1.5	1.5	N/A	0.75
SSTL135	Both	1.35	1.35	N/A	0.675
SSTL135_R	HR	1.35	1.35	N/A	0.675
SSTL12	Both	1.2	1.2	N/A	0.60
SSTL18_I_DCI	HP	1.8	1.8	N/A	0.90
SSTL15_DCI	HP	1.5	1.5	N/A	0.75
SSTL135_DCI	HP	1.35	1.35	N/A	0.675
SSTL12_DCI	HP	1.2	1.2	N/A	0.60
DIFF_HSTL_I	Both	1.5	1.5 ⁽²⁾	N/A	N/A
DIFF_HSTL_II	HR	1.5	1.5 ⁽²⁾	N/A	N/A
DIFF_HSTL_I_18	Both	1.8	1.8 ⁽²⁾	N/A	N/A
DIFF_HSTL_II_18	HR	1.8	1.8 ⁽²⁾	N/A	N/A
DIFF_SSTL18_I	Both	1.8	1.8 ⁽²⁾	N/A	N/A
DIFF_SSTL18_II	HR	1.8	1.8 ⁽²⁾	N/A	N/A
DIFF_SSTL15	Both	1.5	1.5 ⁽²⁾	N/A	N/A
DIFF_SSTL15_R	HR	1.5	1.5 ⁽²⁾	N/A	N/A
DIFF_SSTL135	Both	1.35	1.35 ⁽²⁾	N/A	N/A
DIFF_SSTL135_R	HR	1.35	1.35 ⁽²⁾	N/A	N/A
DIFF_SSTL12	Both	1.2	1.2 ⁽²⁾	N/A	N/A
DIFF_HSUL_12	Both	1.2	1.2 ⁽³⁾	N/A	N/A
DIFF_HSTL_I_DCI	HP	1.5	1.5	N/A	N/A
DIFF_HSTL_I_DCI_18	HP	1.8	1.8	N/A	N/A
DIFF_SSTL18_I_DCI	HP	1.8	1.8	N/A	N/A
DIFF_SSTL15_DCI	HP	1.5	1.5	N/A	N/A
DIFF_SSTL135_DCI	HP	1.35	1.35	N/A	N/A
DIFF_SSTL12_DCI	HP	1.2	1.2	N/A	N/A
DIFF_HSUL_12_DCI	HP	1.2	1.2	N/A	N/A
BLVDS_25	HR	2.5	Any	N/A	N/A
LVDS_25	HR	2.5 ⁽⁵⁾	2.5 ⁽¹⁾	2.5	N/A
RSDS_25	HR	2.5 ⁽⁵⁾	2.5 ⁽¹⁾	2.5	N/A
TMDS_33	HR	3.3	Any	N/A	N/A
MINI_LVDS_25	HR	2.5 ⁽⁵⁾	2.5 ⁽¹⁾	2.5	N/A
PPDS_25	HR	2.5 ⁽⁵⁾	2.5 ⁽¹⁾	2.5	N/A
LVDS	HP	1.8	1.8 ⁽¹⁾	1.8	N/A
LVPECL	HR	N/A	Any	N/A	N/A
SLVS_400_18	HP	N/A	1.8 ⁽¹⁾	1.8	N/A
SLVS_400_25	HR	N/A	2.5 ⁽¹⁾	2.5	N/A
SUB_LVDS	Both	1.8	1.8 ⁽¹⁾	1.8	N/A
DIFF_HSTL_I_12	HP	1.2	1.2 ⁽²⁾	N/A	N/A
DIFF_POD10	HP	1.0	1.0 ⁽²⁾	N/A	N/A
DIFF_POD12	HP	1.2	1.2 ⁽²⁾	N/A	N/A
DIFF_HSTL_I_DCI_12	HP	1.2	1.2	N/A	N/A
DIFF_POD10_DCI	HP	1.0	1.0	N/A	N/A
DIFF_POD12_DCI	HP	1.2	1.2	N/A	N/A
POD10	HP	1.0	1.0	N/A	0.70
POD12	HP	1.2	1.2	N/A	0.84
POD10_DCI	HP	1.0	1.0	N/A	0.70
POD12_DCI	HP	1.2	1.2	N/A	0.84
MIPI_DPHY_DCI	HP ⁽⁴⁾	1.2	1.2	1.2	N/A
Notes: 1. Differential inputs for these standards can be placed in banks with V _CCO levels that are different from the required level for outputs. Some important criteria to consider: a. The optional internal differential termination is not used, DIFF_TERM_ADV = TERM_NONE or DIFF_TERM = FALSE (default value), unless the V _CCO voltage is at the level required for outputs. b. The differential signals at the input pins meet the V _IN requirements in the Recommended Operating Conditions table of the specific UltraScale device data sheet [Ref 2] . c. The differential signals at the input pins meet the V _IDIFF and V _ICM requirements in the DC Specifications tables in the specific UltraScale device data sheet [Ref 2] . In some cases, to accomplish this it might be necessary to provide an external circuit to both AC-couple and DC-bias the pins. 2. When on-die input termination is used (ODT is set to a value other than RTT_NONE) or when DQS_BIAS = TRUE, the VCCO input voltage is as specified. When ODT = RTT_NONE and DQS_BIAS = FALSE, the VCCO input voltage is any allowed voltage. 3. When on-die input termination is used (ODT value set to something other than RTT_NONE) or when DQS_BIAS is set to TRUE, the V _CCO input voltage is 1.2V for HP I/O banks. In HR I/O banks, when DQS_BIAS = FALSE, or in HP I/O banks when ODT = RTT_NONE, the V _CCO input voltage is any allowed voltage. 4. The DPHY_DCI I/O standard is only supported in Virtex UltraScale+, Kintex UltraScale+, Artix UltraScale+, and Zynq UltraScale+ devices. 5. If the V _CCO voltage exceeds 2.85V, the outputs are 3-stated. The device should always be operated within the recommended operating range as specified in the UltraScale device data sheets [Ref 2] .

Table: Attribute Options, Bidirectional Buffer Availability, and DCI Termination Type , summarizes the DRIVE and SLEW attribute options, bidirectional buffer availability, and DCI termination type for each supported I/O standard.

Table 1-78: Attribute Options, Bidirectional Buffer Availability, and DCI Termination Type
I/O Standard	I/O Bank Type	Output Slew				Output Drive				Bidirectional Buffers ⁽¹⁾	Termination Type ⁽²⁾
		HR I/O Banks		HP I/O Banks		HR I/O Banks		HP I/O Banks			Input	Output ⁽³⁾
		Allowed Values	Default	Allowed Values	Default	Allowed Values	Default	Allowed Values	Default		Input	Output ⁽³⁾
LVTTL	HR	SLOW FAST	SLOW	N/A		4, 8, 12, 16	12	N/A		Yes	None	None
LVCMOS33	HR	SLOW FAST	SLOW	N/A		4, 8, 12, 16	12	N/A		Yes	None	None
LVCMOS25	HR	SLOW FAST	SLOW	N/A		4, 8, 12, 16	12	N/A		Yes	None	None
LVCMOS18	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	4, 8, 12, 16	12	2, 4, 6, 8, 12	12	Yes	None	None
LVCMOS15	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	4, 8, 12, 16	12	2, 4, 6, 8, 12	12	Yes	None	None
LVCMOS12	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	4, 8, 12	12	2, 4, 6, 8	12	Yes	None	None
HSUL_12	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Single ⁽⁴⁾	Driver ⁽⁴⁾
LVDCI_18	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	None	Driver
LVDCI_15	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	None	Driver
HSUL_12_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Single	Driver
HSLVDCI_18	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	None	Driver
HSLVDCI_15	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	None	Driver
HSTL_I	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
HSTL_II	HR	SLOW FAST	SLOW	N/A		N/A		N/A		Yes	Split	None
HSTL_I_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
HSTL_I_18	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
HSTL_II_18	HR	SLOW FAST	SLOW	N/A		N/A		N/A		Yes	Split	None
HSTL_I_DCI_18	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
HSTL_I_12	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
HSTL_I_DCI_12	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split (UltraScale devices only)	Driver
SSTL18_I	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
SSTL18_II	HR	SLOW FAST	SLOW	N/A		N/A		N/A		Yes	Split	None
SSTL15	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
SSTL15_R	HR	SLOW FAST	SLOW	N/A		N/A		N/A		Yes	Split	None
SSTL135	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
SSTL135_R	HR	SLOW FAST	SLOW	N/A		N/A		N/A		Yes	Split	None
SSTL12	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
SSTL18_I_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
SSTL15_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
SSTL135_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
SSTL12_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
DIFF_HSTL_I	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
DIFF_HSTL_II	HR	SLOW FAST	SLOW	N/A		N/A		N/A		Yes	Split	None
DIFF_HSTL_I_18	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
DIFF_HSTL_II_18	HR	SLOW FAST	SLOW	N/A		N/A		N/A		Yes	Split	None
DIFF_SSTL18_I	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
DIFF_SSTL18_II	HR	SLOW FAST	SLOW	N/A		N/A		N/A		Yes	Split	None
DIFF_SSTL15	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
DIFF_SSTL15_R	HR	SLOW FAST	SLOW	N/A		N/A		N/A		Yes	Split	None
DIFF_SSTL135	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
DIFF_SSTL135_R	HR	SLOW FAST	SLOW	N/A		N/A		N/A		Yes	Split	None
DIFF_SSTL12	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
DIFF_HSUL_12	Both	SLOW FAST	SLOW	SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Single ⁽⁴⁾	Driver ⁽⁴⁾
DIFF_HSTL_I_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
DIFF_HSTL_I_DCI_18	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
DIFF_SSTL18_I_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
DIFF_SSTL15_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
DIFF_SSTL135_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
DIFF_SSTL12_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
DIFF_HSUL_12_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Single	Driver
BLVDS_25	HR	N/A		N/A		N/A		N/A		Yes	None	None
LVDS_25	HR	N/A		N/A		N/A		N/A		Yes ⁽⁵⁾	None	None
RSDS_25	HR	N/A		N/A		N/A		N/A		Yes ⁽⁵⁾	None	None
TMDS_33	HR	N/A		N/A		N/A		N/A		Yes ⁽⁵⁾	None	None
MINI_LVDS_25	HR	N/A		N/A		N/A		N/A		Yes ⁽⁵⁾	None	None
PPDS_25	HR	N/A		N/A		N/A		N/A		Yes ⁽⁵⁾	None	None
LVDS	HP	N/A		N/A		N/A		N/A		Yes ⁽⁵⁾	None	None
LVPECL	HR	N/A		N/A		N/A		N/A		No	None	None
SLVS_400_18	HP	N/A		N/A		N/A		N/A		No	None	None
SLVS_400_25	HR	N/A		N/A		N/A		N/A		No	None	None
SUB_LVDS	Both	N/A		N/A		N/A		N/A		Yes ⁽⁵⁾	None	None
DIFF_HSTL_I_12	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split	Driver
DIFF_POD10	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Single	Driver
DIFF_POD12	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Single	Driver
DIFF_HSTL_I_DCI_12	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Split (UltraScale devices only)	Driver
DIFF_POD10_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Single	Driver
DIFF_POD12_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Single	Driver
POD10	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Single	Driver
POD12	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Single	Driver
POD10_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Single	Driver
POD12_DCI	HP	N/A		SLOW MEDIUM FAST	SLOW	N/A		N/A		Yes	Single	Driver
MIPI_DPHY_DCI	HP ⁽⁶⁾	N/A		N/A	N/A	N/A		N/A		No	N/A	Driver
Notes: 1. The bidirectional buffers column describes the I/O standards use of a bidirectional signal. 2. The DCI termination type column describes the type of termination available for the DCI I/O standards. Split refers to the split-termination resistors. Single refers to single resistor termination to V _CCO . 3. A value of DRIVER in this column only applies to HP I/O banks 4. INTERM = Single and OUTTERM = DRIVER for HP I/O banks, INTERM = NONE and OUTTERM = NONE for HR I/O banks. 5. The bidirectional configuration on these I/O standards is a fixed impedance structure optimized to 100 Ω differential. They are intended to only be used in point-to-point transmissions that do not have turn around timing requirements. Use BLVDS_25 for bus structures. 6. The MIPI_DPHY_DCI standard is only supported in Virtex UltraScale+, Kintex UltraScale+, Artix UltraScale+, and Zynq UltraScale+ devices.