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| 型號(hào)： | EB402 |
| 英文描述： | EB402 Evaluation Board user＇s guide 7/01 |
| 中文描述： | EB402評(píng)估板用戶指南7月1日 |
| 文件頁(yè)數(shù)： | 25/84頁(yè) |
| 文件大小： | 1014K |
| 代理商： | EB402 |
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PIO[7:0] (Programmable I/Os)
3-9
Each PIO has a user congured jumper to select pull-up or pull-down
termination. The default conguration is pulled-up. When the PIOs are
congured as inputs, the jumpers can be used to continuously reset, or
enable, a codec for testing or debugging.
PIO0 enables the codec on Serial Port 0. Jumper JP11 selects pull-up
or pull-down termination. LED 3 is connected to PIO0 and illuminates
whenever PIO0 is LOW.
PIO1 resets the codec on Serial Port 0. Jumper JP10 selects pull-up or
pull-down termination.
PIO2 enables the codec on Serial Port 1. Jumper JP9 selects pull-up or
pull-down termination.
PIO3 resets the codec on Serial Port 1. Jumper JP8 selects pull-up or
pull-down termination.
3.2.2 Controlling the HPI Mode
When booting from the on-chip ROM, PIO1 controls the mode of the
LSI402ZX HPI. As the LSI402ZX comes out of reset, PIO1 selects Intel
or Motorola operating mode. If PIO1 is pulled-up (HIGH), HPI transfer
mode is set to Motorola mode. If PIO1 is pulled-down (LOW), HPI
transfer mode is set to Intel mode.
3.2.3 Controlling the External Expansion Interface (EEI)
PIO[6:4] control peripheral devices attached to the EEI. PIO[6:4] are
terminated by pull-up or pull-down resistors, which are connected to the
signal lines by user congured jumpers. The default conguration is
pulled-up.
3.2.4 Controlling Test and Debug Congurations
When PIO[6:0] are congured as inputs, the pull-up/pull-down resistors
can set input conditions for test programs, or control the program’s ow.
For example, a resistor can set an input HIGH when testing a software
loop that waits for a HIGH input before continuing the program.
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