
OHCI Controller Programming Model
150
September 2005
SCPS110
Table 721. Link Enhancement Control Register Description (Continued)
BIT
FIELD NAME
TYPE
DESCRIPTION
9
RSVD
R
Reserved. Bit 9 returns 0b when read.
8
enab_dv_ts
RW
Enable DV CIP timestamp enhancement. When bit 8 is set to 1b, the enhancement is enabled for DV
CIP transmit streams (FMT = 00h). The default value for this bit is 0b.
7
enab_unfair
RW
Enable asynchronous priority requests. OHCI-Lynx
compatible. Setting bit 7 to 1b enables the link
to respond to requests with priority arbitration. It is recommended that this bit be set to 1b. The default
value for this bit is 0b.
6
RSVD
R
This bit is not assigned in the PCIxx12 follow-on products, because this bit location loaded by the serial
EEPROM from the enhancements field corresponds to bit 23 (programPhyEnable) in the host
controller control register at OHCI offset 50h/54h (see Section 8.16).
53
RSVD
R
Reserved. Bits 53 return 000b when read.
2
RSVD
R
Reserved. Bit 2 returns 0b when read.
1
enab_accel
RW
Enable acceleration enhancements. OHCI-Lynx
compatible. When bit 1 is set to 1b, the PHY layer
is notified that the link supports the IEEE Std 1394a-2000 acceleration enhancements, that is,
ack-accelerated, fly-by concatenation, etc. It is recommended that this bit be set to 1b. The default
value for this bit is 0b.
0
RSVD
R
Reserved. Bit 0 returns 0b when read.
This bit is cleared only by the assertion of GRST.
7.25 Subsystem Access Register
Write access to the subsystem access register updates the subsystem identification registers identically to
OHCI-Lynx
. The system ID value written to this register may also be read back from this register. See
Table 722 for a complete description of the register contents.
Function 1 register offset: F8h
Register type:
Read/Write
Default value:
0000 0000h
BIT NUMBER
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
RESET STATE
0
BIT NUMBER
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RESET STATE
0
Table 722. Subsystem Access Register Description
BIT
FIELD NAME
TYPE
DESCRIPTION
3116
SUBDEV_ID
RW
Subsystem device ID alias. This field indicates the subsystem device ID.
150
SUBVEN_ID
RW
Subsystem vendor ID alias. This field indicates the subsystem vendor ID.
These bits are cleared only by the assertion of GRST.