IDT CPS-1848, User Manual

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10. Registers > Port Function Registers
CPS-1848 User Manual 401 June 2, 2014
Formal Status This document is confidential and is subject to an NDA.
Integrated Device Technology
10.16.31 Broadcast Port Implementation Specific Error Detect Register
This register captures implementation specific physical layer errors. The per-port version of this register is Port {0..17}
Implementation Specific Error Detect Register .
Register Name: BCAST_PORT_IMPL_SPEC_ERR_DET
Reset Value: 0x0000_0000 Register Offset: 0xF4FF08
Bits 0 1 2 3 4 5 6 7
00:07 ERR_RATE TTL_EVEN
T
CRC_EVE
NT
PNA UNSOL_LR UNEXP_AC
KID
PNA_RETR
Y
RTE_ISSU
E
08:15 Reserved SET_ACKI
D
TX_DROP MANY_RE
TRY
RX_DROP Reserved BAD_TT SHORT
16:23 UNSOL_RF
R
FATAL_TO RETRY RETRY_AC
KID
STOMP_T
O
RX_STOM
P
LR_CMD LR_X2
24:31 UNEXP_E
OP
UNEXP_ST
OMP
PORT_INIT PORT_WID
TH
IDLE_IN_P
KT
LOA BAD_CTL REORDER
Bits Name Description Type
Reset
Value
0 ERR_RATE 1 = The port encountered a condition when the error rate has
exceeded the programmed error rate threshold. RW 0
1 TTL_EVENT 1 = A packet has been stored in the port output buffer for a period
of time that exceeds the time to live timeout value. This also
represents a dropped packet event. RW 0
2 CRC_EVENT 1 = A CRC anomaly has been detected
Possibilities include:
• A packet has encountered a number of retries that has
exceeded the programmed CRC limit and was dropped.
• A packet was received with a CRC Error on a port that is
configured for CRC Retransmission Suppression and was
dropped.
RW 0
3 PNA 1 = Received a NACK with a cause other than lack of resources.
The Port_n_Error register has a bit for all NACKs; however, the
user may want to be able to turn off the counting of NACKs due to
lack of resources (which some may view as not being an error).
The methodology achieved with this bit is to turn off all NACKs via
CS_NOT_ACC in the
Port {0..17} Error Detect CSR so that the
user can disable the counting of lack of resource NACKs (by
disabling all NACKs at the Part 8 level), and then re-enable the
counting of all other NACKs with this bit.
RW 0
4 UNSOL_LR 1 = Received an unexpected Link-Response RW 0