參數(shù)資料
型號： CY4615
廠商： Cypress Semiconductor Corp.
英文描述： EZ-USB AT2⑩ USB 2.0 to ATA/ATAPI Bridge
中文描述： 的EZ - USB AT2⑩個USB 2.0到ATA / ATAPI的橋
文件頁數(shù)： 15/26頁
文件大?。?/td> 193K
代理商： CY4615
CY7C68300
Document #: 38-08011 Rev. *B
Page 15 of 26
0x06
ATA UDMA Enable
Bit (7)
Enable Ultra DMA data transfer support for ATAPI devices. If
enabled, and if the ATAPI device reports UDMA support for
the indicated modes, the EZ-USB AT2 will utilize UDMA data
transfers at the highest negotiated rate possible.
0 = Disable ATA device UDMA support.
1 = Enable ATA device UDMA support.
Bit (6)
Enable Ultra DMA data transfer support for ATAPI devices. If
enabled, and if the ATAPI device reports UDMA support for
the indicated modes, the EZ-USB AT2 will utilize UDMA data
transfers at the highest negotiated rate possible.
0 = Disable ATAPI device UDMA support.
1 = Enable ATAPI device UDMA support.
Bit (5:0)
These bits select which UDMA modes, if supported, are
enabled. Setting to 1 enables. Multiple bits may be set. The
EZ-USB AT2 will operate in the highest enabled UDMA mode
supported by the device. The EZ-USB AT2 supports UDMA
modes 2 and 4 only.
Bit Descriptions
5 Reserved. Must be set to 0.
4 Enable UDMA mode 4.
3 Reserved. Must be set to 0.
2 Enable UDMA mode 2.
1 Reserved. Must be set to 0.
0 Reserved. Must be set to 0.
Bits(7:2)
Bits(1:0)
These bits select which PIO modes, if supported, are
enabled. Setting to 1 enables. Multiple bits may be set. The
EZ-USB AT2 will operate in the highest enabled PIO mode
supported by the device. The EZ-USB AT2 supports PIO
modes 0, 3, and 4 only. PIO mode 0 is always enabled by
internal logic.
Bit Descriptions
1 Enable PIO mode 4.
0 Enable PIO mode 3.
Must be set to 0x00.
Must be set to 0x00.
Must be set to 0x00.
Must be set to 0x00.
Must be set to 0x00.
Must be set to 0x00.
Must be set to 0x00.
Must be set to 0x00.
0xD4
ATAPI UDMA Enable
UDMA Modes
0x07
Reserved
PIO Modes
0x03
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
Device Descriptor
0x10
0x11
0x12
0x13
0x14
0x15
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
bLength
bDescriptor Type
bcdUSB (LSB)
bcdUSB (MSB)
bDeviceClass
bDeviceSubClass
Length of device descriptor in bytes.
Descriptor type.
USB Specification release number in BCD.
0x12
0x01
0x00
0x02
0x00
0x00
Device class.
Device subclass.
Table 5-6. EEPROM Organization
(continued)
EEPROM
Address
Field Name
Field Description
Required
Contents
Suggested
Contents
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