10. Registers > LP-Serial Extended Features Registers with Software Assisted Error Recovery
CPS-1848 User Manual
232
June 2, 2014
Formal Status
This document is confidential and is subject to an NDA.
Integrated Device Technology
10.5.5
Port {0..17} Link Maintenance Request CSR
For base address information, see
Port {0..17} S-RIO Extended Features Base Addresses
The captured ackID is not used to accept any outstanding packets or restart transmission of packets. If the captured
ackID is invalid, then
Port {0..17} Error and Status CSR
[PORT_ERR] is set but
[LR_ACKID_ILL] is not set.
Register Name: PORT_{0..17}_LINK_MAINT_REQ_CSR
Reset Value: 0x0000_0000
Register Offset: 0x (0x20 * port_num)
Bits
0
1
2
3
4
5
6
7
00:07
Reserved
08:15
Reserved
16:23
Reserved
24:31
Reserved
CMD
Bits
Name
Description
Type
Reset
Value
0:28
Reserved
Reserved
RO
0
29:31
CMD
Command to be sent in the link-request control symbol. If read,
this field returns the last written value.
0b011 = Reset device
0b100 = Input status
0b000–0b010 = Reserved
0b101–0b111 = Reserved
Note: Writing 0b011 sends four reset control symbols to the link
partner.
Note: Transmitting an “Input status” request will cause the
[OUTPUT_ERR] bit to be set.
Note (Revision A/B only): The
[OUTPUT_FAIL] bit must be clear and remain clear before
any link request can be sent.
RW
0b000