ucb1500 NXP Semiconductors, ucb1500 Datasheet - Page 32

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

Philips Semiconductors
9397 750 07443
Product specification
8.5.1 [00a0]: Counter control/status for channel #1
8.5.2 [00a1-00af]: Reserved
8.5.3 [00b0]: Counter control/status for channel #0
8.5.4 [00b1-00bf]: Reserved
8.6.1 [00c0]: AC97 DMA Channel 0 rate
8.5 DMA counter control
8.6 AC-97 registers
Table 48: Counter control/status for channel #1 register bit description
Table 49: Counter control/status for channel #0 register bit description
Table 50: AC97 DMA channel 0 rate register bit description
Bit
15-1
0
Bit
15-1
0
Bit
15-8
7-0
Description
Reserved.
General counter #0 overflow
Indicates general purpose counter #0 (reg 62h) overflow if set.
Description
Reserved.
General counter #1 overflow
Indicates general purpose counter #1 (reg 65h) overflow if set.
Description
Receive rate
Used to specify receive sample rate for receive channel #0.
Rate = 48 kHz * Receive rate / 256
For example, if set to 80h, every other AC97 received frame will be discarded by
UCB1500.
00h = 256 (default mode = 48 kHz)
ffh = 255
Transmit rate
Used to specify transmit sample rate for transmit channel #0.
Rate = 48 kHz * Transmit rate / 256
For example, if set to 80h, every other AC97 frame transmitted will contain valid
data.
00h = 256 (default mode = 48 kHz)
ffh = 255
Rev. 03 — 7 July 2000
PCI to AC97 bridge/host controller
© Philips Electronics N.V. 2000. All rights reserved.
UCB1500
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