 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
FDC37C78-HT Datasheet(PDF) 16 Page - Microchip Technology |
|
|
|||||||||||||||||||||||||||||
FDC37C78-HT Datasheet(HTML) 16 Page - Microchip Technology |
|
|
16 / 82 page  16 DATA RATE SELECT REGISTER (DSR) Address 3F4 WRITE ONLY This register is write only. It is used to program the data rate, amount of write precompensation, power down status, and software reset. The data rate is programmed using the Configuration Control Register (CCR) not the DSR, for PC/AT and Microchannel applications. Other applications can set the data rate in the DSR. The data rate of the floppy controller is the most recent write of either the DSR or CCR. The DSR is unaffected by a software reset. A hardware reset will set the DSR to 02H, which corresponds to the default precompensation setting and 250 kbps. BIT 0 and 1 DATA RATE SELECT These bits control the data rate of the floppy controller. See Table 13 for the settings corresponding to the individual data rates. The data rate select bits are unaffected by a software reset, and are set to 250 kbps after a hardware reset. BIT 2 through 4 PRECOMPENSATION SELECT These three bits select the value of write precompensation that will be applied to the WDATA output signal. Table 12 shows the precompensation values for the combination of these bits settings. Track 0 is the default starting track number to start precompensation. this starting track number can be changed by the configure command. BIT 5 UNDEFINED Should be written as a logic "0". BIT 6 LOW POWER A logic "1" written to this bit will put the floppy controller into Manual Low Power mode. The floppy controller clock and data separator circuits will be turned off. The controller will come out of manual low power mode after a software reset or access to the Data Register or Main Status Register. BIT 7 SOFTWARE RESET This active high bit has the same function as the DOR RESET (DOR bit 2) except that this bit is self clearing. Table 10 - Precompensation Delays 7 6 5 4 3 2 1 0 S/W RESET POWER DOWN 0 PRE- COMP2 PRE- COMP1 PRE- COMP0 DRATE SEL1 DRATE SEL0 RESET COND. 0 0 0 0 0 0 1 0 PRECOMP 432 PRECOMPENSATION DELAY 111 001 010 011 100 101 110 000 0.00 ns-DISABLED 41.67 ns 83.34 ns 125.00 ns 166.67 ns 208.33 ns 250.00 ns Default (See Table 14) |
Similar Part No. - FDC37C78-HT |
|
Similar Description - FDC37C78-HT |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
