ucb1500 NXP Semiconductors, ucb1500 Datasheet - Page 14

• Manufacturer Part Number: ucb1500
• Description: Pci To Ac97 Bridge/host Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 07443
Product specification
[05-04]: Command Register
Table 15: Command Register bit description
Bit
15-10
9(r)
8
7(r)
6
5(r)
4(r)
3(r)
2
1(r)
0
Description
Reserved.
Fast Back-to-back Transactions
Always 0, fast back-to-back transactions is not supported.
SERR enable
If set, SERR driver is enabled; if 0, SERR is disabled.
Address/Data Stepping
Always 0, address/data stepping is not implemented.
Parity Error Response
When set, the device must take its normal action when a parity error is detected.
If this bit is 0, the device must ignore any parity errors that it detects and continue
normal operation.
VGA Snooping
Always 0, not implemented.
Memory Write and Invalidate Command
Always 0, UCB1500 does not generate memory write and invalidate command.
Special Cycle Response
Always 0, UCB1500 ignores all special cycles.
Bus Master Control
PCI Master access enable; this bit must be enabled to activate UCB1500 DMA
register.
1 = enable.
Memory Space Response
Always 0, UCB1500 does not respond to memory space accesses.
I/O Space Control
UCB1500 control register I/O space access enable.
1 = enable.
Rev. 03 — 7 July 2000
PCI to AC97 bridge/host controller
© Philips Electronics N.V. 2000. All rights reserved.
UCB1500
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