Register Map - 2.6 English

1G/10G/25G Switching Ethernet Subsystem Product Guide (PG292)

Document ID
PG292
Release Date
2021-02-05
Version
2.6 English

Following are the register Map descriptions:

Table 1. Register Map
Offset Register Name Access Description
0x0000 TOD_CONFIG RW

Main configuration

[0] – Enable system timer

A ‘0’ to this bit field disables system timer IP

[1] – Enable external ToD bus

Write ‘1’ to enable ToD bus signals. The overwrite mode field further defines how signaling is used

This is present only when the core is generated with external ToD bus I/F support

[3:2] – Overwrite Mode:

  • 0x0 - System timer counter is not overwritten at 1-PPS event from external ToD bus
  • 0x1 - system timer counter is overwritten with the external ToD bus seconds input at 1-PPS event from external ToD bus
  • 0x2 - system timer counter is overwritten with value stored in the software TOD_SW_SEC_0/1 register at 1-PPS event from the external ToD bus
  • 0x3 - Reserved

The above modes are only present when the core is generated with Ext ToD bus interface support

[4 to 19] – Enable port TX and RX timers

  • [4] = Enable Port-0 TX and RX
  • [5] = Enable Port-1 TX and RX
  • [16] = Enable Port-15 TX and RX

The upper limit for port number depends on the number of ports enabled at the time of generating core

[31:20] - Reserved

0x0004 TOD_SNAPSHOT RW1T

[0] – Snapshot all timers

Writing 1’b1 will snapshot all counters (system, external ToD bus, and all enabled ports)

[31:1] - Reserved

0x0008 TOD_INTR_ENABLE RW

Interrupt enable register

[0] - 1-PPS interrupt

[31:1] - Reserved

0x000C TOD_INTR_STATUS RW1C

Interrupt clear register

[0] - 1-PPS interrupt

[31:1] - Reserved

0x0010 TOD_SW_SEC_0 RW [31:0] - Overwrite master timer’s second field bits [31:0]
0x0014 TOD_SW_SEC_1 RW

[15:0] - Overwrite master timer’s second field bits [47:32]

[31:16] - Reserved

0x0018 TOD_SW_NS RW

[29:0] - Overwrite master timer’s second field bits

[31:30] - Reserved

0x001C TOD_SW_LOAD RW1T

[0] - Write ‘1’ initiates a load of the system timer’s ToD values from the TOD_SW_SEC_0/1, TOD_SW_NS, and TOD_SW_CTIME_0/1 registers

[1] - Write ‘1’ initiates a load of the system timer’s ToD offset value from the TOD_SEC_SYS_OFFSET_0/1, and TOD_NS_SYS_OFFSET_0 registers

Note: Offset is added by logic prior to system timer’s output to the port timers. As such, offset is not reflected by system timer ToD read backs.

[31:0] - Reserved

0x0020 TOD_SW_CTIME_0 RW [31:0] - Overwrite master timer’s CF field bits [31:0]
0x0024 TOD_SW_CTIME_1 RW

[30:0] - Overwrite master timer’s second field bits [63:32]

[31] - Reserved

0x0028 TOD_SEC_SYS_OFFSET_0 RW

{TOD_SEC_SYS_OFFSET_1[15:0], TOD_SEC_SYS_OFFSET_0[31:0]} - Represents system timer 48b seconds field signed offset value

TOD_NS_SYS_OFFSET_0[29:0] - Represents system timer 30b nano second field signed offset value

Signed bit interpreted as follows for TOD_SEC_SYS_OFFSET

If [47] = 1’b1 then subtract from system timer

If [47] = 1’b0 then add to system timer

Need to apply trigger bit [1] at register 0x001C

0x002C TOD_SEC_SYS_OFFSET_1 RW
0x0030 TOD_NS_SYS_OFFSET_0 RW
0x0100 TOD_SYS_SEC_0 RO [31:0] - Snapshot of system timer’s second field [31:0]
0x0104 TOD_SYS_SEC_1 RO

[15:0] - Snapshot of system timer’s second field [47:32]

[31:16] - Reserved

0x0108 TOD_SYS_NS RO

[29:0] - Snapshot of system timer’s Nano-second Field [29:0]

[31:30] - Reserved

0x010C TOD_SYS_OFFSET RW

[31:0] - Signed offset to be applied to seconds value loaded from the external ToD bus, and to be added to 0 nanoseconds field when a 1PPS event occurs on the External ToD bus.

The signed value is expressed in 2-16 ns

This is present only when the core is generated with Ext ToD Bus support

0x0110 TOD_SYS_CTIME_0 RO [31:0] - Snapshot of system timer’s CF Field [31:0]
0x0114 TOD_SYS_CTIME_1 RO

[30:0] - Snapshot of system timer’s CF Field [63:32]

[31] - Reserved

0x0120 TODBUS_SEC_0 RO Current value of the Ext ToD bus’s second Field [31:0]
0x0124 TODBUS_SEC_1 RO

[15:0] - Current value of the Ext ToD bus’s second field [47:32]

[31:16] - Reserved

0x012C TODBUS_SYS_DIFF RO [31:0] - Once a second comparison of external ToD bus captured value and system Timer’s internal ToD value in signed unit of 2-16ns