CY7C68300 CYPRESS [Cypress Semiconductor], CY7C68300 Datasheet - Page 15

• Manufacturer Part Number: CY7C68300
• Manufacturer: CYPRESS [Cypress Semiconductor]

Table 5-6. EEPROM Organization (continued)
Document #: 38-08011 Rev. *B
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
Device Descriptor
0x10
0x11
0x12
0x13
0x14
0x15
EEPROM
Address
ATA UDMA Enable
ATAPI UDMA Enable
UDMA Modes
Reserved
PIO Modes
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
bLength
bDescriptor Type
bcdUSB (LSB)
bcdUSB (MSB)
bDeviceClass
bDeviceSubClass
Field Name
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
4
3
2
1
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
0
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.
Length of device descriptor in bytes.
Descriptor type.
USB Specification release number in BCD.
Device class.
Device subclass.
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.
Enable PIO mode 4.
Enable PIO mode 3.
Field Description
Required
Contents
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x12
0x01
0x00
0x02
0x00
0x00
CY7C68300
Page 15 of 26
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0xD4
0x03