VT6305 datasheet(19/35 Pages) ETC

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1394 Host 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 register address is assumed to be a bit mask where

one bits determine which bits should be cleared.

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

7-0

Reserved

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

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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