ISD-200 Datasheet, PDF (55/64 Pages) List of Unclassifed Manufacturers – USB Mass Storage Class Bulk-Only Specification Compliant

ISD-200 ASIC Datasheet
POR,
ATA_EN=0 ATA_EN=1 POR,
ATA_EN=1 ATA_EN=0
ATA_EN=1
ATA_EN=0
BUS_POWER=0, ATA HIGH POWER=0(byte 8, bit 4)
E^2
EE CLKN EE CLKN EE CLKN X
EE CLKN
EE CLKN
E^2 + Test pins
EE CLKN
EE CLKN
EE CLKN
Test CLKN Test CLKN -> EE CLKN
EE CLKN
Test pins
Test CLKN Test CLKN Test CLKN Test CLKN Test CLKN Test CLKN
I_MODE + Test
pins
Test CLKN Test CLKN Test CLKN FBh CLKN FBh CLKN
FBh CLKN
BUS_POWER=1, ATA HIGH POWER=0(byte 8, bit 4)
E^2
EE CLKN X
EE CLKN X
EE CLKN
X
E^2 + Test pins EE CLKN X
EE CLKN X
EE CLKN
X
Test pins
Test CLKN X
Test CLKN X
Test CLKN X
I_MODE + Test Test CLKN X
Test CLKN X
FBh CLKN X
pins
BUS_POWER=0, ATA HIGH POWER=1(byte 8, bit 4)
E^2
12MHz -> X X
X
X
EE CLKN
EE CLKN
E^2 + Test pins
EE CLKN
EE CLKN
EE CLKN
Test CLKN Test CLKN -> EE CLKN
EE CLKN
Test pins
Test CLKN Test CLKN Test CLKN Test CLKN Test CLKN Test CLKN
I_MODE + Test
pins
Test CLKN Test CLKN Test CLKN FBh CLKN FBh CLKN
FBh CLKN
BUS_POWER=1, ATA HIGH POWER=1(byte 8, bit 4)
E^2
X
X
X
X
X
X
E^2 + Test pins X
X
X
X
X
X
Test pins
Test CLKN X
Test CLKN X
Test CLKN X
I_MODE + Test
pins
Test CLKN X
Test CLKN X
FBh CLKN X
Note: All values indicate CLKN output before USB Configuration is set. When ATA HIGH POWER=1 and
BUS_POWER=1, the CLKN output will not turn on until the USB configuration is set to a non-zero value. Refer
to the “BUS_POWER=1, ATA HIGH POWER=0” section in order to tell what the CLKN output will be when the
USB Configuration is set.
For devices using CLKN that allow ATA_EN to be deasserted, it is suggested that the BUS_POWER pin is
deasserted in conjunction with ATA_EN if BUS_POWER is asserted itself.
If a device uses both test pins and E^2 or FBh to configure CLKN then it is suggested that both CLKN
values match.
If a device is to use E^2 CLKN values then the test pins must be set to either CLKN test mode in order to
get the expected value. If ATA_EN is allowed to deassert then there is the possibility that the test pin
CLKN values will be used.
102. Failure to override descriptors for slave device when BSY=0 and DRQ=1.
This issue is regarding ISD200 Configuration byte 8 bit 3. This case will usually only occur when the
device is a slave and there is a host side pull-down on DD7 and no pull-down on DD3. Is this case ISD200
will never enumerate.
Potential fixes:
1. Pull-up on DD7
2. Pull-down on DD7 and DD3
In-System Design Confidential
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