ISD-200 Datasheet, PDF (38/64 Pages) List of Unclassifed Manufacturers – USB Mass Storage Class Bulk-Only Specification Compliant

ISD-200 ASIC Datasheet
Device/Head register –
The DEV bit indicates the selected device.
Status register –
BSY shall be cleared to zero upon command completion.
DRDY shall be set to one.
DF (Device Fault) shall be cleared to zero.
DRQ shall be cleared to zero.
ERR shall be cleared to zero.
Error Outputs
If the device does not support this command, the device shall return command aborted. Otherwise, the
device shall not report an error.
Description
When the command is issued, the device sets the BSY bit to one, and prepares to transfer 320 bytes of
configuration/descriptor data to the ISD-200. The device then sets DRQ to one and clears BSY to zero.
The arrangement and meaning of the FBh data bytes are specified in Tables 3, 7-11. An example of FBh
programming is shown in Appendix A.
EVENT_NOTIFY
The vendor-specific Event-notify command enables the ISD-200 to communicate the occurrence of certain
events to the attached device. (See Operational Modes, NEJECT, NCART_DET Pins)
Command Code
Specified in the ISD-200 Configuration Bytes, address 0x2. Programming the command code to 0x00
disables the Event-notify feature.
Feature Set
The PACKET Command feature set is used.
Protocol
Non-data (refer to ATA/ATAPI-4 Specification, section 9.9).
Input
Register
Features
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
7
USB
Reset
6
Class
Specific
Reset
5
USB
Suspend
4
USB
Resume
3
Cartridge
Insert
2
Cartridge
Release
N/A
N/A
STATE0
STATE1
N/A
Specified in the ISD-200 Configuration Bytes
1
Eject
Button
Press
0
Eject
Button
Release
Features register –
The USB Reset bit indicates that a USB Reset event has occurred.
The Class Specific Reset bit indicates that an MSC Reset was issued by the host.
The USB Suspend bit indicates that the USB Bus has gone into suspend.
The USB Resume bit denotes that the USB Bus is no longer in suspend.
The Cartridge Insert bit is set when the device media is inserted.
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In-System Design Confidential