VT6307L datasheet(28/54 Pages) VIA

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VT6307 PCI 1394a Host Controller

Revision 1.2 October 1, 2002

-22-

Technologies, Inc.

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Link Controller Memory-Space Registers

These registers occupy a 2048-byte space in system memory

(offsets 0-7FFh).

This address space begins at the address

contained

in the 1394 Configuration Space “Base Address

All registers must be accessed as 32-bit words on 32-bit

boundaries.

Writes to reserved addresses have undefined

results and reads from reserved addresses return indeterminate

data. Unless specified otherwise, all register fields default to 0

and are unchanged after a 1394 bus reset.

Some registers are designated as Set and Clear registers.

These registers are in pairs, where a read of either address will

return the current contents of the register. Data written to the

Set register address is assumed to be a bit mask where one bits

determine which bits should be set. Data written to the Clear

determine which bits should be cleared.

Memory Offset 0 – Version............................................... RO

31-0 Version – OHCI 1.0 Mode .............. reads 0001 0000

Version – OHCI 1.1 Mode .............. reads 0001 0010

Memory Offset 8 – Asynchronous Transmit Retries ..... RW

31-29 Second Limit ........................................................ RO

Count in Seconds (modulo 8).

These bits and the

Cycle Limit bits below define a time limit for retry

attempts when the outbound dual-phase retry protocol

is in use.

28-16 Cycle Limit ......................................................... RO

Count in Cycles (modulo 8000). These bits and the

Second Limit bits above define a time limit for retry

attempts when the outbound dual-phase retry protocol

is in use.

15-12 Reserved

........................................always reads 0

11-8 Max Physical Response Retries ..............default = 0

Specifies how many times to attempt to retry the

transmit operation for the physical response packet

when a “busy” or “ack_type_error” acknowledge is

received from the target node.

This value is used

only for responses to physical requests.

7-4

Max AT Response Retries .......................default = 0

Specifies to the Asynchronous Transmit Response

subsystem how many times to attempt to retry the

transmit operation for the response packet when a

“busy” or “ack_type_error” acknowledge is received

from the target node.

This value is used only for

responses sent by software via the Asynchronous

Transmit Response DMA context.

3-0

Max AT Request Retries ..........................default = 0

Specifies to the Asynchronous Transmit DMA

Request subsystem how many times to attempt to

retry the transmit operation for a packet when a

“busy” or “ack_type_error” acknowledge is received

from the target node.

This value is used only for

responses sent by software via the Asynchronous

Transmit Request DMA context.

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