This part is not recommended for new designs
Use CY7C68300B EZ-USB AT2LP™ USB2.0 to ATA/ATAPI
Bridge for new designs
CY7C68300A
Table 6-6. EEPROM Organization (continued)
EEPROM
Required Suggested
Contents Contents
Address
Field Name
Field Description
0x06
ATA UDMA Enable
Bit (7)
0xD4
Enable Ultra DMA data transfer support for ATAPI devices. If
enabled, and if the ATAPI device reports UDMA support for
the indicatedmodes, theCY7C68300A will utilize UDMA data
transfers at the highest negotiated rate possible.
0 = Disable ATA device UDMA support.
1 = Enable ATA device UDMA support.
ATAPI UDMA Enable
UDMA Modes
Bit (6)
Enable Ultra DMA data transfer support for ATAPI devices. If
enabled, and if the ATAPI device reports UDMA support for
the indicatedmodes, theCY7C68300A 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
CY7C68300A will operate in the highest enabled UDMA
mode supported by the device. The CY7C68300A supports
UDMA modes 2 and 4 only.
Bit Descriptions
5
4
3
2
1
0
Reserved. Must be set to 0.
Enable UDMA mode 4.
Reserved. Must be set to 0.
Enable UDMA mode 2.
Reserved. Must be set to 0.
Reserved. Must be set to 0.
0x07
Reserved
Bits(7:2)
0x03
PIO Modes
Bits(1:0)
These bits select which PIO modes, if supported, are
enabled. Setting to 1 enables. Multiple bits may be set. The
CY7C68300A will operate in the highest enabled PIO mode
supported by the device. The CY7C68300A supports PIO
modes 0, 3, and 4 only. PIO mode 0 is always enabled by
internal logic.
Bit Descriptions
1
0
Enable PIO mode 4.
Enable PIO mode 3.
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
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.
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
Device Descriptor
0x10
0x11
0x12
0x13
0x14
0x15
bLength
Length of device descriptor in bytes.
Descriptor type.
USB Specification release number in BCD.
0x12
0x01
0x00
0x02
0x00
0x00
bDescriptor Type
bcdUSB (LSB)
bcdUSB (MSB)
bDeviceClass
bDeviceSubClass
Device class.
Device subclass.
Document #: 38-08031 Rev. *E
Page 10 of 21
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