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參數(shù)資料
| 型號： | UCB1500 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 總線控制器 |
| 英文描述： | PCI to AC97 bridge/host controller |
| 中文描述： | PCI BUS CONTROLLER, PQFP80 |
| 封裝： | 12 X 12 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-315-1, LQFP-80 |
| 文件頁數(shù)： | 46/58頁 |
| 文件大?。?/td> | 1001K |
| 代理商： | UCB1500 |
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Philips Semiconductors
UCB1500
PCI to AC97 bridge/host controller
Objective specification
Rev. 01 — 4 February 2000
46 of 58
9397 750 06854
Philips Electronics N.V. 2000. All rights reserved.
9.3 Continuous circular queue example
9.3.1
Transmit algorithm
1. Create a transmit DT using the circular queue configuration.
2. Intialize UCB1500 DMA registers
Set the transmit DTP Invalid Bit Mask of the DMA channel in use.
Start transmission, while monitoring transmit done interrupt.
At transmit done interrupt, examine transmit DT index and Byte counter to
perform buffer management, if required.
9.3.2
Receive algorithm
1. Create a receive DT using the circular queue configuration.
2. Initialize UCB1500 DMA registers (refer to
Section 8.1
).
a. Set the receive DTP Invalid Bit Mask of the DMA channel in use.
b. Start transmission, while monitoring receive done interrupt.
c. At receive done interrupt, examine receive DT index and Byte counter to
perform buffer management, if required.
(1) In this example, descriptor entry 5 points to the beginning of the descriptor table.
(2) The descriptor entries are processed in sequence, from 0 to 4, then loops back to 0.
(3) Each data buffer can be a maximum of 64k in size, and does not have to be sequential in
memory.
(4) If the Interrupt bit of an entry is set, it can generate a ‘Done’ interrupt provided that the
corresponding interrupt is enabled.
Fig 5.
Continuous circular queue example
CB1500 REGISTER
DESCRIPTOR TABLE
MEMORY
DATA
DT=1 DT Link=1
4
3
2
1
0
DTP
SC00210
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