PM7367 datasheet(76/323 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

performance statistics on channels and not for initiating packet specific

responses such as retransmission.

Transmit Channel Descriptor Reference Table

The TMAC maintains a Transmit Channel Descriptor Reference (TCDR) table in

which is stored certain information relating to DMA activity on each channel

together with TD pointers which are used by the TMAC to sort packet chains

supplied by the host into per-channel linked lists (see below). The caching of

DMA-related information reduces the number of host bus accesses required to

process each data packet, while the sorting into per-channel linked lists

eliminates head of line blocking. Each channel is provided with two entries in the

TCDR table, one for high priority packets (Pri 1) and one for low priority packets

(Pri 0). The structure of the TCDR table is shown in Figure 13 below.

Figure 13 – Transmit Channel Descriptor Reference Table

MCE

Last TD Pointer

Current TD Pointer

Bytes to Tx

[1 0]

Abrt IOC

Host TD Pointer

[13 0]

DMA Current Address

[31 0]

Reserved

MCE

Last TD Pointer

[13 0]

Current TD Pointer

[13 0]

Bytes to Tx

[1 0]

Abrt IOC

Host TD Pointer

[13 0]

DMA Current Address

[31 0]

MCE

Last TD Pointer

Current TD Pointer

Bytes to Tx

[1 0]

Abrt IOC

Host TD Pointer

[13 0]

DMA Current Address

[31 0]

Bit 31

Bit 0

TCC 0, Pri 0

TCC 1, Pri 0

TCC 31, Pri 1

Next TD Pointer

[13 0]

Reserved

Next TD Pointer

[13 0]

Reserved

Next TD Pointer

[13 0]

Last

PiP

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