ISD-300A1 Cypress Semiconductor Corp, ISD-300A1 Datasheet - Page 33

• 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/ATAPI Interface
The ATA/ATAPI port on the ISD-300A1 is compliant with the Information Technology – AT Attachment
with Packet Interface – 5 (ATA/ATAPI-5) Specification, T13/1321D Rev 3. The ISD-300A1 supports both
ATAPI packet commands as well as ATA commands (by use of ATA Command Blocks). Additionally,
the ISD-300A1 translates ATAPI SFF-8070i commands to ATA commands for seamless integration of
ATA devices with generic Mass Storage Class BOT drivers. The ISD-300A1 also provides a vendor-
specific “event notify” ATA command to automatically communicate certain USB and system events to the
attached device.
Protocol
The ISD-300A1 supports command protocol flows as defined in the ATA/ATAPI-5 Specification.
Commands are grouped into different classes, based on the protocol followed for command execution.
The ATA/ATAPI interface supports the following clarifications:
Reset Mapping
The ATA/ATAPI interface responds to several resets: Power-on, USB, MSC, and Vendor-specific Soft
reset.
In the case of a power-on reset, a full device initialization is performed. FBh data is retrieved and stored if
the I_MODE pin is set active.
In the cases of USB reset and MSC reset, a partial initialization is performed which excludes all attempts to
perform Identify Device commands.
In the case of a Vendor-specific Soft reset, only the internal ISD-300A1 state machines are reset.
Device Requirements
Attached mass storage devices must support the following:
ATA Reset, A1h, FBh
After deassertion of ATA_NRESET, BSY and DRQ must be cleared by the device within the ATA
Initialization Timeout configuration setting value.
ATA Polling Device
The device shall be capable of being a polling only device. The ATA signal INTRQ is not used by the
ISD-300A1.
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Immediately after the reset recovery period, the ISD-300A1 will write 0x00 to the Device Control
register.
Arbitrary byte count transfers are supported.
16-bit data reads and writes are supported.
8-bit data transfers are not supported.
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ISD-300A1