SFP28 Module Connectors

[ This Figure , callouts 14, 15]

The ZCU111 board hosts four SFP28 connectors J27, J32, J37, and J42. The connectors are housed within a single quad SFP28 cage assembly. The ganged SFP28 cage supports up to four SFP/SFP+/SFP28 modules. This Figure shows the SFP28 module connector circuitry typical of the four implementations.

Note: The SFPx_TX_DISABLE default 2-pin jumper is On, which means the SFPx_TX_DISABLE net is pulled Low, enabling the TX output of the SFP module.

Figure 3-23: SFP28 Module Connectivity
X-Ref Target - Figure 3-23

Table: SFP28 Control and Status Board Test Points lists the SFP28 module connections to RFSoC U1.

Table 3-21: SFP28 Control and Status Board Test Points
SFP28 Control/ Status Signal	Board Connection
SFP0 J27 ⁽¹⁾ ⁽²⁾
SFP_TX_FAULT	Test point J28	High = Fault
SFP_TX_FAULT	Test point J28	Low = Normal operation
SFP_TX_DISABLE	Jumper J29	Off = SFP disabled
SFP_TX_DISABLE	Jumper J29	On = SFP enabled
SFP_MOD_DETECT	Test point J30	High = Module not present
SFP_MOD_DETECT	Test point J30	Low = Module present
SFP_RS0	PU R276/PD R278	PU R276 = Full RX bandwidth
SFP_RS0	PU R276/PD R278	PD R278 = Reduced RX bandwidth
SFP_RS1	PU R277/PD R279	PU R277 = Full TX bandwidth
SFP_RS1	PU R277/PD R279	PD R279 = Reduced TX bandwidth
SFP_LOS	Test point J31	High = Loss of receiver signal
SFP_LOS	Test point J31	Low = Normal operation
SFP1 J32 ⁽¹⁾ ⁽²⁾
SFP_TX_FAULT	Test point J33	High = Fault
SFP_TX_FAULT	Test point J33	Low = Normal operation
SFP_TX_DISABLE	Jumper J35	Off = SFP disabled
SFP_TX_DISABLE	Jumper J35	On = SFP enabled
SFP_MOD_DETECT	Test point J34	High = Module not present
SFP_MOD_DETECT	Test point J34	Low = Module present
SFP_RS0	PU R281/PD R283	PU R281 = Full RX bandwidth
SFP_RS0	PU R281/PD R283	PD R283 = Reduced RX bandwidth
SFP_RS1	PU R282/PD R284	PU R282 = Full TX bandwidth
SFP_RS1	PU R282/PD R284	PD R284 = Reduced TX bandwidth
SFP_LOS	Test point J36	High = Loss of receiver signal
SFP_LOS	Test point J36	Low = Normal operation
SFP2 J37 ⁽¹⁾ ⁽²⁾
SFP_TX_FAULT	Test point J38	High = Fault
SFP_TX_FAULT	Test point J38	Low = Normal operation
SFP_TX_DISABLE	Jumper J40	Off = SFP disabled
SFP_TX_DISABLE	Jumper J40	On = SFP enabled
SFP_MOD_DETECT	Test point J39	High = Module not present
SFP_MOD_DETECT	Test point J39	Low = Module present
SFP_RS0	PU R289/PD R291	PU R289 = Full RX bandwidth
SFP_RS0	PU R289/PD R291	PD R291 = Reduced RX bandwidth
SFP_RS1	PU R290/PD R292	PU R290 = Full TX bandwidth
SFP_RS1	PU R290/PD R292	PD R292 = Reduced TX bandwidth
SFP_LOS	Test point J41	High = Loss of receiver signal
SFP_LOS	Test point J41	Low = Normal operation
SFP3 J42 ⁽¹⁾ ⁽²⁾
SFP_TX_FAULT	Test point J43	High = Fault
SFP_TX_FAULT	Test point J43	Low = Normal operation
SFP_TX_DISABLE	Jumper J44	Off = SFP disabled
SFP_TX_DISABLE	Jumper J44	On = SFP enabled
SFP_MOD_DETECT	Test point J45	High = Module not present
SFP_MOD_DETECT	Test point J45	Low = Module present
SFP_RS0	PU R294/PD R300	PU R294 = Full RX bandwidth
SFP_RS0	PU R294/PD R300	PD R300 = Reduced RX bandwidth
SFP_RS1	PU R295/PD R301	PU R295 = Full TX bandwidth
SFP_RS1	PU R295/PD R301	PD R301 = Reduced TX bandwidth
SFP_LOS	Test point J46	High = Loss of receiver signal
SFP_LOS	Test point J46	Low = Normal operation
Notes: 1. The RS0/RS1 PU/PD resistors are not populated.There are pull-down resistors built into the SFP28 modules that select the lower bandwidth mode of the module. 2. BW selection is also available via I2C control. For this and additional information about the SFP28 module, see SFF-8402 and SFF-8432 at the specification website [Ref 29] .

Table: SFP28 RFSoC Connections lists the SFP28 module connections to the Zynq UltraScale+ RFSoC U1.

Table 3-22: SFP28 RFSoC Connections
XCZU28DR Pin (U1)	Schematic Net Name	I/O Standard	SFP+ Pin	SFP+ Pin Name
SFP0 J27
Y35	SFP0_TX_P	⁽¹⁾	18	TD_P
Y36	SFP0_TX_N	⁽¹⁾	19	TD_N
AA38	SFP0_RX_P	⁽¹⁾	13	RD_P
AA39	SFP0_RX_N	⁽¹⁾	12	RD_N
G12	SFP0_TX_DISABLE_B	LVCMOS12	3	TX_DISABLE
SFP1 J32
V35	SFP1_TX_P	⁽¹⁾	18	TD_P
V36	SFP1_TX_N	⁽¹⁾	19	TD_N
W38	SFP1_RX_P	⁽¹⁾	13	RD_P
W39	SFP1_RX_N	⁽¹⁾	12	RD_N
G10	SFP0_TX_DISABLE_B	LVCMOS12	3	TX_DISABLE
SFP2 J37
T35	SFP2_TX_P	⁽¹⁾	18	TD_P
T36	SFP2_TX_N	⁽¹⁾	19	TD_N
U38	SFP2_RX_P	⁽¹⁾	13	RD_P
U39	SFP2_RX_N	⁽¹⁾	12	RD_N
K12	SFP0_TX_DISABLE_B	LVCMOS12	3	TX_DISABLE
SFP3 J42
R33	SFP3_TX_P	⁽¹⁾	18	TD_P
R34	SFP3_TX_N	⁽¹⁾	19	TD_N
R38	SFP3_RX_P	⁽¹⁾	13	RD_P
R39	SFP3_RX_N	⁽¹⁾	12	RD_N
J7	SFP0_TX_DISABLE_B	LVCMOS12	3	TX_DISABLE
Notes: 1. Bank 128 GTY connections, I/O standards not applicable.

For additional information about the small form factor pluggable SFP28 module, see the SFF-8402 and SFF-8432 specifications at the SNIA Technology Affiliates website [Ref 29] .