PM7367 datasheet(77/323 Pages) PMC

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PM7367 FREEDM-32P32

DATA SHEET

PMC-1991499

ISSUE 2

FRAME ENGINE AND DATA LINK MANAGER

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMER’S INTERNAL USE

Table 11 – Transmit Channel Descriptor Reference Table Fields

Field

Description

A copy of the M bit in the TD currently being read.

A copy of the CE bit in the TD currently being read.

Last TD Pointer [13:0] Offset to the head of the last host-linked chain of TDs

to be read. (See Figure 14)

Indicates if this channel is active (i.e. provisioned). If

the channel is active, the A bit is set to logic 1. If the

channel is inactive, the A bit is set to logic 0.

Indicates whether the linked list of packets for this

channel is empty or not. If the D bit is set to logic 1,

the list is not empty and the current TD pointer field is

valid (i.e., it points to a valid TD). If the D bit is set to

logic 0, the list is empty and the current TD pointer field

is invalid.

Current TD Pointer

[13:0]

Offset to the TD currently being read.

Bytes To Tx[15:0]

The Bytes to Tx[15:0] bits are used to indicate the total

number of bytes that remain to be read in the current

buffer. Each access to the data buffer decrements this

value. A value of zero in this field indicates the buffer

has been completely read.

ABRT

A copy of the ABRT bit in the TD currently being read.

IOC

A copy of the IOC bit in the TD currently being read.

PiP

The Packet Transfer in Progress bit indicates that a

packet is currently being transmitted on this channel at

this priority level.

Indicates that a ‘null abort’ is to be sent to the

downstream block when it next requests data on this

channel. The NA bit is set if a mal-formed TD is

encountered while searching down a host chain.

Indicates that a underflow has occurred on this

channel. This bit is set in response to an underflow

indication for the downstream THDL block and is

cleared when a TDR is written to the TDR Free Queue

(or to the free queue cache).

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