Usb Device And Lsi Connection Verification Method - Epson S1R72U16 Support Manual

• Method for confirming CS0-, CS1-, DA0 to DA2, DIOW-, DIOR-, INTRQ, DMARQ,
• Method for confirming CS0-, CS1-, DA0 to DA2, DIOW-, DIOR-, INTRQ, DMARQ,
4.3.2

USB Device and LSI Connection Verification Method

This section describes method for verifying connections between USB devices and the LSI.
• Checking the initial state of the VBUS supply control circuit
S1R72U16 Development
Support Manual (Rev.2.00)
* In ATAPI mode, issue the WRITE command in place of the WRITE SECTOR(S)
command and the READ command in place of the READ SECTOR(S) command.
DMACK-, DD0 to DD15 signals
[When using Multi Word DMA transfer]
Confirm by issuing a command from the main CPU and by using Multi Word DMA
transfer.
1. Issue the SET FEATURE command. Set Multi Word DMA transfer.
2. Issue the WRITE DMA command. Confirm that the command ends normally and
that the history entry appears as "IDE: command [CAh]" – "IDE: Multi Word
DMA (H->D)" – "IDE: INTRQ" – "IDE: idle".
3. Issue the READ DMA command and read the data written in 2. Confirm that the
command ends normally and that the history entry appears as "IDE: command
[C8h]" – "IDE: Multi Word DMA (D->H)" – "IDE: INTRQ" – "IDE: idle".
This enables evaluation of the CS0-, CS1-, DA0 to DA2, DIOW-, DIOR-, INTRQ,
DMARQ, and DMACK- signals.
4. Compare the data written by the WRITE DMA command against the data read by
the READ DMA command. Confirm that they match.
This enables evaluation of the DD0 to DD15 signals.
* In ATAPI mode, issue the WRITE command instead of the WRITE DMA command
and the READ command instead of the READ DMA command.
DMACK-, IORDY, and DD0 to DD15 signals
[When using Ultra DMA transfer]
Confirm by issuing a command from the main CPU and by using Ultra DMA transfer.
1. Issue the SET FEATURE command. Set Ultra DMA transfer.
The subsequent control and confirmation methods are the same as for Multi Word
DMA. Transfer except that the history information will contain "Ultra DMA" instead of
"Multi Word DMA."
1. Confirm that "USB: VBUS overcurrent" does not appear in the history without
connecting a USB device.
* Otherwise, there may be a problem in the VBUS supply control circuit.
EPSON
4. History Data Details
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