PM3350-SW datasheet(159/224 Pages) PMC

159 / 224 page

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

157

master needs access to the PCI bus. The PM3350 has no specific

requirements in this regard; this register always returns zero.

Bit

Type

Function

Default

Bit 31 to 25

Reserved

0x00

Bit 24

R/W

TestDiscardTimer

Bit 23 to 16

R/W

Tdiscon

0x6E

Bit 15 to 10

Reserved

0x00

Bit 9

Mrd

Bit 8

Merror

Bit 7 to 0

R/W

MaxBurstLen[7:0]

0x10

MaxBurstLen[7:0]:

This register should be initialized with the maximum single-transaction burst

length in DWORDs to be used by the PCI bus master. It defaults to 16

DWORDS.

Merror:

A logic one in this bit position indicates that the PCI bus master has

encountered a fatal error.

Mrd:

A logic one in this bit position indicates that the PCI bus master is currently

performing a read transaction.

Tdiscon:

The slave timer disconnect register is used to limit TRDY and STOP

assertion based on the value in this register. Tdiscon[3:0] sets the disconnect

delay for the first data access, while Tdiscon[7:4] defines the disconnect

delay for subsequent data phases of the same burst. Note that the actual

number of cycles, as measured from the start of the data phase to the cycle

in which the disconnect is returned by the PCI bus slave interface, is two

greater than the numeric values programmed into the Tdiscon[3:0] and

Tdiscon[7:4] fields. This register is for factory configuration purposes only.

The value defaults to 0x6E (disconnect after 16 cycles on the first access and

8 cycles thereafter), and must remain at that value for correct operation.

TestDiscardTimer:

This register bit allows testing of the Discard Timer feature in the PCI bus

slave logic. It defaults to zero. If set to logic 1, it causes the Discard Timer in

the slave to be initialized to 0x2FF0 rather than 0x0000. This bit is for factory

test purposes only. It must remain at logic 0 for correct operation.

PM3350-SW Datasheet(PDF) 159 Page - PMC-Sierra, Inc

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