PM3350-SW datasheet(182/224 Pages) PMC

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ELAN 8X10

PM3350 ELAN 8 X10

DATA SHEET

PMC-970109

ISSUE 3

8 PORT ETHERNET SWITCH

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND PMC-SIERRA, INC. CUSTOMERS ONLY

180

This is used by the Switch Processor firmware during service of an

Acknowledge Interrupt. Implementation of ACKID_NUM is similar to

REQID_NUM with the following differences:

• there is an acknowledge snapshot register

• the Switch Processor does an “ACK_DEC” flip to signal completion of

the service routine for the selected ACKID_NUM.

Bit

Type

Function

Default

Bit 15 to 0

R/W

TCOUNT[15:0]

TCOUNT[15:0]:

This register implements a 16-bit up-down counter. The counter is

incremented and decremented under control of the Switch Processor:

• the counter is incremented if the task counter increment flip is asserted

(task_inc).

• the counter is decremented if the task counter decrement flip is

asserted (task_dec) –AND- task_inc is not simultaneously asserted.

• If the TCOUNT[15:0] register is non-zero, the TaskCounter interrupt is

asserted to the Switch Processor.

Note: the present firmware implementation of the PM3351 does not use this

counter. It may be used in future firmware releases.

Bit

Type

Function

Default

Bit 15 to 0

R/W

NFREE[15:0]

Bit

Type

Function

Default

Bit 15 to 8

Unused

Bit 7 to 0

R/W

NFREE[23:16]

NFREE[23:0]:

The next free pointer is the address in local memory of the next available

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