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參數(shù)資料
| 型號： | GL811USB |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | USB 2.0 to ATA / ATAPI Bridge Controller |
| 中文描述： | USB 2.0至的ATA / ATAPI控制器橋 |
| 文件頁數(shù)： | 14/36頁 |
| 文件大?。?/td> | 291K |
| 代理商： | GL811USB |
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GL811USB – USB 2.0 to ATA / ATAPI Bridge Controller
2000-2002 Genesys Logic Inc.—All rights reserved.
Page 13
6.3.4 Switching Characteristics
Parameter
Min
Typ
Max
Unit
X1 crystal frequency
11.97
12
12.03
MHz
X1 cycle time
83.3
ns
D+/D- rise time with 50pF loading
4
20
ns
D+/D- fall time with 50pF loading
4
20
ns
6.4 AC Characteristics- ATA/ ATAPI
The GL811USB complies with ATA / ATAPI-6 specification rev 1.0, which supports
following data transfer modes:
1. PIO (Programmed Input/ Output) data transfer:
PIO data transfers are performed by the host processor utilizing PIO register
accesses to the Data register.
2. DMA (Direct Memory Access) data transfer:
DMA data transfer means of data transfer between device and host memory
without host processor intervention.
-
Multiword DMA: Multiword DMA is a data transfer protocol used with the READ
DMA, WRITE DMA, READ DMA QUEUED, WRITE DMA QUEUED and
PACKET commands. When a Multiword DMA transfer is enabled as indicated by
IDENTIFY DEVICE or IDENTIFY PACKET DEVICE data, this data transfer
protocol shall be used for the data transfers associated with these commends.
(Please refer to the ATA / ATAPI-6 specification rev 1.0 for more information.)
-
Ultra DMA: Ultra DMA Is a data transfer protocol used with the READ DMA,
WRITE DMA, READ DMA QUEUED, WRITE DMA QUEUED and PACKET
commands. When this protocol is enabled, the Ultra DMA protocol shall be used
instead of the Multiword DMA protocol when these commands are issued by the
host. This protocol applies to the Ultra DMA data burst only. (Please refer to the
ATA / ATAPI-6 specification rev 1.0 for more information.)
Following listed the symbols and their respective definitions that are used in the timing
diagram:
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