NCT6627UD Nuvoton Technology Corporation of America, NCT6627UD Datasheet - Page 118

• Manufacturer Part Number: NCT6627UD
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of NCT6627UD

• Lead Free Status / Rohs Status: Supplier Unconfirmed

The 2 MB/S data rate for the tape drive is only supported by setting DRATE1 and DRATE0 to 01, as well as
setting DRT1 and DRT0 (CRF4 and CRF5 for logical device 0) to 10. Please see the functional description of
CRF4 or CRF5 and the data rate table for individual data-rate settings.
The FIFO register consists of four status registers in a stack, and only one register is presented to the data bus at
a time. The FIFO register stores data, commands, and parameters, and it provides disk-drive status information.
In addition, data bytes pass through the data register to program or obtain results after a command. In the
W83627UHG, this register is disabled after reset. The FIFO can enable it and change its values through the
configure command.
Status Register 0 (ST0)
9.2.7 FIFO Register (R/W base address + 5)
NAME
BIT
BIT
0
PRECOMP
DATA RATE
2
0
0
0
0
1
1
1
1
250 KB/S
300 KB/S
500 KB/S
DRATE 0.
1 MB/S
2 MB/S
1
0
0
1
1
0
0
1
1
IC Interrupt Code
7
0
0
1
0
1
0
1
0
1
6
SE Seek
0.00 ns (disabled)
End
5
250K – 1 Mbps
Default Delays
125.00 ns
166.67 ns
208.33 ns
250.00 ns
41.67 ns
83.34 ns
DEFAULT PRECOMPENSATION DELAYS
Equipment
Check
DESCRIPTION
EC
PRECOMPENSATION DELAY
4
0 1: 300 KB/S (MFM), 150 KB/S (FM),
RWC# = 0
1 0: 250 KB/S (MFM), 125 KB/S (FM),
RWC# = 0
1 1: 1 MB/S (MFM), Illegal (FM), RWC# = 1
NR Not
Ready
-109-
3
41.67ns
20.8 ns
125 ns
125 ns
125 ns
W83627UHG/NCT6627UD
HD Head
Address
2
Publication Release Date: October 26, 2010
2 Mbps Tape drive
0.00 ns (disabled)
Default Delays
125.00 ns
41.17 ns
104.2 ns
20.8 ns
83.3 ns
62.5ns
US1, US0 Drive Select
1
0
Revision 1.7