ISD-300A1 Cypress Semiconductor Corp, ISD-300A1 Datasheet - Page 36

• 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
bmATACBRegisterSelect –
bATACBTransferBlockCount –
Bit 5
Bits 4-3
Bit 2
Bit 1
Bit 0
Setting the appropriate bit fields shall cause the taskfile read or write register access to occur.
Taskfile read data shall always be 8 bytes in length. Unselected taskfile register data shall be
returned as 00h. Taskfile register accesses shall occur in sequential order as shown (Bit 0 first, Bit
7 last). The bmATACBRegisterSelect bitmap shall be as defined below.
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
This value shall denote the maximum requested block size in 512 byte blocks. This variable shall
be set to the value last used for “Sectors per block” in the SET_MULTIPLE_MODE command.
Valid values are 0, 1, 2, 4, 8, 16, 32, 64, and 128 (0 indicates 256 sectors per block). Command
failed status shall be returned if an invalid value is detected in the ATACB. Non-multiple
commands shall set this value to 1 (block size of 512 bytes).
DEVOverride – Use the DEV value specified in the ATACB.
0 = The DEV bit value will be determined from ISD-300A1 Configuration data
(0x5 bit 5).
1= The DEV bit value will be determined from the ATACB(0xB bit 4).
DPErrorOverride(1:0) - Device and Phase Error Override. These bits shall not
be set in conjunction with bmATACBActionSelect TaskFileRead. The order of
precedence for error override shall be dependant on the amount of data left to
transfer when the error is detected, as depicted in the ATACB Command Flow
diagram.
00 = Data accesses are halted if a device or phase error is detected.
01 = Phase error conditions are not used to qualify the occurrence of data
accesses.
10 = Device error conditions are not used to qualify the occurrence of data
accesses.
11 = Neither device error or phase error conditions are used to qualify the
occurrence of data accesses.
PollAltStatOverride - Poll ALTSTAT Override.
0 = The Alternate Status registered shall be polled until BSY=0 before
proceeding with the ATACB operation.
1 = Execution of the ATACB shall proceed with the data transfer without polling
the Alternate Status register until BSY=0.
DeviceSelectionOverride - Device Selection Override. This bit shall not be set
in conjunction with bmATACBActionSelect TaskFileRead.
0 = Device selection shall be performed prior to command register write
accesses.
1 = Device selection shall not be performed prior to command register write
accesses.
TaskFileRead - Read and return the task file register data selected in
bmATACBRegisterSelect. If TaskFileRead is set, the dCBWDataTransferLength
field must be set to 8.
0 = Execute ATACB command and data transfer (if any).
1 = Only task file registers selected in bmATACBRegisterSelect shall be read.
Task file registers not selected in bmATACBRegisterSelect shall not be accessed
and 00h shall be returned for the unselected register data.
(3F6h) Device Control / Alternate Status
(1F1h) Features / Error
(1F2h) Sector Count
(1F3h) Sector Number
(1F4h) Cylinder Low
(1F5h) Cylinder High
(1F6h) Device / Head
(1F7h) Command / Status
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ISD-300A1