ISD-300A1 Cypress Semiconductor Corp, ISD-300A1 Datasheet - Page 35

• Manufacturer Part Number: ISD-300A1
• Description: IC USB 2.0 BRIDGE BULK 100LQFP
• Manufacturer: Cypress Semiconductor Corp

Specifications of ISD-300A1

• Applications: USB 2.0 to ATA/ATAPI Bridge
• Interface: ATA, ATAPI
• Voltage - Supply: 3 V ~ 3.6 V
• Package / Case: 100-LQFP
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1459

October 19, 2001
ATA Command Block
ATA commands for the ISD-300A1 are supported by command encoding in the command block portion of
the MSC Command Block Wrapper (CBW). Refer to the USB Mass Storage Class (MSC) Bulk Only
Transport Specification for information on CBW formatting.
The ATA Command Block (ATACB) provides a means of passing ATA commands and ATA register
accesses for execution. The ATACB resides in the CBWCB portion of the CBW. The ATACB is
distinguished from other command blocks by the first two bytes of the command block matching the
wATACBSignature. Only command blocks that have a valid wATACBSignature are interpreted as ATA
Command Blocks. All other fields of the CBW and restrictions on the CBWCB shall remain as defined in
the USB Mass Storage Class Bulk Only Transport Specification. The ATACB shall be 16 bytes in length.
The following table and text defines the fields of the ATACB.
Table 15 – ATA Command Block Formatting
Field Descriptions
wATACBSignature –
bmATACBActionSelect –
13-15
Byte
5-12
This signature indicates that the CBWCB contains an ATACB. The signature field shall contain the
ATA Command Designator value obtained from ISD-300A1 configuration space to indicate an
ATACB (the default value is 0x2424). Devices capable of accepting only ATA Command Blocks
shall return a command failed status if the wATACBSignature is not correct.
The bit fields of this register shall control the execution of the ATACB. Refer to Figure 3– ATA
Command Block Flow Diagram for further clarification. The bitmap of the
bmATACBActionSelect shall be defined as follows:
Bit 7
Bit 6
0-1
2
3
4
7
IdentifyPacketDevice – ATA/ATAPI Identify Packet Device Command. Setting
IdentifyPacketDevice indicates the data phase will contain ATAPI (A1h) or
ATA (Ech) IDENTIFY device data. Setting IdentifyPacketDevice when the data
phase is not IDENTIFY data will cause undetermined device behavior.
0 = Normal operation.
1 = Data phase of command will contain ATAPI or ATA IDENTIFY data,
allowing the device to parse data for required device information.
UDMACommand - Ultra DMA Data Transfer Enable (Multi-word DMA not
supported). Setting UDMA Command with non-UDMA capable devices or
using it with non-UDMA commands will cause undetermined behavior.
0 = Do not use DMA data transfers (PIO transfers only).
1 = Utilize Ultra DMA for data transfers (device must be capable).
6
5
bATACBTransferBlockCount
bATACBTaskFileWriteData
bmATACBRegisterSelect
bmATACBActionSelect
30
wATACBSignature
Reserved (0)
4
3
2
1
ISD-300A1
0