62
Lucent Technologies Inc.
FW322
1394A PCI PHY/Link Open Host Controller Interface
Data Sheet, Rev. 1
February 2001
Internal Registers
(continued)
Table 51. Bus Options Register Description
Bit
31
Field Name
irmc
Type
RW
Description
Isochronous Resource Manager Capable.
IEEE
1394 bus
management field. Must be valid when bit 17 (linkEnable) of the
host controller control register is set.
Cycle Master Capable.
IEEE
1394 bus management field. Must
be valid when bit 17 (linkEnable) of the host controller control
register is set.
Isochronous Support Capable
.
IEEE
1394 bus management
field. Must be valid when bit 17 (linkEnable) of the host controller
control register is set.
Bus Manager Capable.
IEEE
1394 bus management field. Must
be valid when bit 17 (linkEnable) of the host controller control
register is set.
IEEE
1394 Bus Management Field.
Must be valid when bit 17
(linkEnable) of the host controller control register is set.
Reserved
. Bits 26:24 return 0s when read.
Cycle Master Clock Accuracy.
(Accuracy in parts per million.)
IEEE
1394 bus management field. Must be valid when bit 17
(linkEnable) of the host controller control register is set.
IEEE
1394 Bus Management Field.
Hardware initializes this field
to indicate the maximum number of bytes in a block request packet
that is supported by the implementation. This value,
max_rec_bytes, must be 512 greater and is calculated by
2
(max_rec + 1)
. Software may change this field; however, this field
must be valid at any time bit 17 (linkEnable) of the host controller
control register is set. A received block write request packet with a
length greater than max_rec_bytes may generate an
ack_type_error. This field is not affected by a soft reset, and
defaults to value indicating 2048 bytes on a hard reset.
Reserved
. Bits 11:8 return 0s when read.
Generation Counter.
This field is incremented if any portion of the
configuration ROM has been incremented since the prior bus
reset.
Reserved
. Bits 5:3 return 0s when read.
Link Speed.
This field returns 010, indicating that the link speeds
of 100 Mbits/s, 200 Mbits/s, and 400 Mbits/s are supported.
30
cmc
RW
29
isc
RW
28
bmc
RW
27
pmc
RW
26:24
23:16
Reserved
cyc_clk_acc
R
RW
15:12
max_rec
RW
11:8
7:6
Reserved
g
R
RW
5:3
2:0
Reserved
Lnk_spd
R
R