PM7366-PI datasheet(76/286 Pages) PMC

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PM7366 FREEDM-8

DATA SHEET

PMC-1970930

ISSUE 4

FRAME ENGINE AND DATA LINK MANAGER

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

Field

Description

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).

Host TD Pointer [13:0]

A copy of the Host Next TD Pointer field of the TD currently being

read, i.e. a pointer to the next TD in the chain currently being read.

(See Figure 14)

DMA Current

Address[31:0]

The DMA Current Address [31:0] bits hold the address of the next

dword in the current buffer. This field is incremented on each

access to the buffer.

Indicates if the linked list of packets for this channel contains more

than one host-linked chain (See Figure 14). If the V bit is set to

logic 1, the list contains more than one chain and the next and last

TD pointer fields are valid. If the V bit is set to logic 0, the list is

either empty or contains only one host-linked chain and the next

and last TD pointer fields are invalid.

Next TD Pointer [13:0]

Offset to the head of the next host-linked chain of TDs to be read.

(See Figure 14)

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