Internal Test Registers for th
OverviewThe DS31256 HDLC controller has some registers that are for internal test use only (see Table 1). The user should avoid using them.
Table 1. CapTIon
| Address (h) | Value (h) |
| 0050 (Test Register) | 0000 |
| 04F0 to 04FF | 0000 |
| 07FD to 07FF | 0000 |
| 08FD to 08FF | 0000 |
| 09F8 to 09FF | 0000 |
All test registers in DS31256 are 16 bits and set to 0 with the hardware or software reset. Only the descripTIon of test register at address 0050 is shown in the data sheet. All other test registers are hidden registers and for internal test only (not shown in the data sheet).
| OFFSET / ADDRESS | ACRONYM | REGISTER NAME | DATA SHEET SECTION |
| 0050 | TEST | Test Register | 5.4 |
Test register bit 0 is used by the factory-test (FT) mode to place the DS31256 in the test mode. For normal device operation, this bit should be set to 0 whenever this register is written to. Setting this bit places the RAMs into a low-power standby mode.
Bits 1 to 15 is for internal (Dallas Semiconductor) test use only, not user test-mode controls. Values ​​of these bits should always be 0. If any of these bits are set to 1, the device does not function properly.
DS31256 InformationFor more information about the DS31256, refer to the data sheet, which is available on our website at DS31256.
ConclusionThis application note has listed the internal test registers for the DS31256 and explained why the user should avoid using these registers.
If you have further questions about our HDLC controller products, please contact the Telecommunication Applications support team via email at var name = "telecom.support @"; var domain = "dalsemi.com"; document.write ("" + name + domain + ""); telecom., or call 972-371-6555.
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