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參數(shù)資料
| 型號： | EB402 |
| 英文描述： | EB402 Evaluation Board user＇s guide 7/01 |
| 中文描述： | EB402評估板用戶指南7月1日 |
| 文件頁數(shù)： | 44/84頁 |
| 文件大小： | 1014K |
| 代理商： | EB402 |
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EB402 Evaluation Board User’s Guide
4-1
Chapter 4
Operation
This chapter describes the Evaluation Board operating modes. This
chapter includes the following sections:
4.1 Boot Modes
The LSI402ZX performs a self-test when it boots from internal ROM. The
self-test writes to all internal memory locations. When the self-test
completes, the LSI402ZX writes test results to the LED display
(LED1–LED16), which is enabled by PCS3N.
After the test results are written to the LED display, the boot ROM code
instructs the LSI402ZX to read PIO1 to determine the HPI transfer mode.
Jumper JP10 selects pull-up or pull-down termination for PIO1. 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.
Next, PIO0 is driven LOW for a few seconds to indicate completion of
self-test, then driven HIGH, then reset to input mode. The Evaluation
Board uses PIO0 as a discrete signal to the Serial Port 0 Interface
connector, where it is used to enable the codec daughterboard.
Jumper JP11 selects pull-up or pull-down termination for this signal.
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