FDC37C78 Ver la hoja de datos (PDF) - SMSC -> Microchip

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FDC37C78

Floppy Disk Controller

SMSC -> Microchip 

DRIVE RATE

DRT1 DRT0

0

0

0

0

0

0

0

0

0

1

0

1

0

1

0

1

1

0

1

0

1

0

1

0

DATA RATE

SEL1 SEL0

1

1

0

0

0

1

1

0

1

1

0

0

0

1

1

0

1

1

0

0

0

1

1

0

Table 11 - Data Rates

DATA RATE

DENSEL (1)

MFM FM

IDENT=1 IDENT=0

1Meg

---

1

0

500

250

1

0

300

150

0

1

250

125

0

1

1Meg

---

1

0

500

250

1

0

500

250

0

1

250

125

0

1

1Meg

---

1

0

500

250

1

0

2Meg

---

0

1

250

125

0

1

DRATE (2)

1

2

1

1

0

0

0

1

1

0

1

1

0

0

0

1

1

0

1

1

0

0

0

1

1

0

Drive Rate Table (Recommended) 00 = 360K, 1.2M, 720K, 1.44M and 2.88M Vertical Format

01 = 3-Mode Drive

10 = 2 Meg Tape

Note 1: This is for DENSEL in normal mode.

Note 2: This is for DRATE0, DRATE1 when Drive Opt are 00.

Table 12 - Default Precompensation Delays

DATA RATE

PRECOMPENSATION

DELAYS

2 Mbps

1 Mbps

500 Kbps

300 Kbps

250 Kbps

20.8 ns

41.67 ns

125 ns

125 ns

125 ns

*The 2 Mbps data rate is only available if VCC = 5V.

17

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