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FDC37C78-HT Datasheet(PDF) 56 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 56 Page - Microchip Technology |
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56 / 82 page  56 When both GAP and WGATE bits of the PERPENDICULAR MODE COMMAND are both programmed to "0" (Conventional mode), then D0, D1, D2, D3, and D4 can be programmed independently to "1" for that drive to be set automatically to Perpendicular mode. In this mode the following set of conditions also apply: 1. The GAP2 written to a perpendicular drive during a write operation will depend upon the programmed data rate. 2. The write pre-compensation given to a perpendicular mode drive wil be 0ns. 3. For D0-D3 programmed to "0" for conventional mode drives any data written will be at the currently programmed write pre-compensation. Note: Bits D0-D3 can only be overwritten when OW is programmed as a "1". If either GAP or WGATE is a "1" then D0-D3 are ignored. Software and hardware resets have the following effect on the PERPENDICULAR MODE COMMAND: 1. "Software" resets (via the DOR or DSR registers) will only clear GAP and WGATE bits to "0". D0-D3 are unaffected and retain their previous value. 2. "Hardware" resets will clear all bits ( GAP, WGATE and D0-D3) to "0", i.e all conventional mode. Table 29 - Effects of WGATE and GAP Bits WGATE GAP MODE LENGTH OF GAP2 FORMAT FIELD PORTION OF GAP 2 WRITTEN BY WRITE DATA OPERATION 0 0 1 1 0 1 0 1 Conventional Perpendicular (500 Kbps) Reserved (Conventional) Perpendicular (1 Mbps) 22 Bytes 22 Bytes 22 Bytes 41 Bytes 0 Bytes 19 Bytes 0 Bytes 38 Bytes |
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