smc256af Numonyx, smc256af Datasheet - Page 51

• Manufacturer Part Number: smc256af
• Description: 32 Mbyte, 64 Mbyte, 128 Mbyte, 256 Mbyte And 512 Mbyte 3.3 V / 5 V Supply Compactflash? Card
• Manufacturer: Numonyx

SMCxxxAF
9
CF-ATA command description
This section defines the software requirements and the format of the commands the host
sends to the card. Commands are issued to the card by loading the required registers in the
command block with the supplied parameters, and then writing the command code to the
command register. There are three classes of command acceptance, all dependent on the
host not issuing commands unless the card is not busy (BSY is ‘0’).
For reasons of backward compatibility some commands are implemented as ‘no operation’
NOP.
Table 46
the individual commands and the task file for each.
Table 46.
Class
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Class 1. Upon receipt of a class 1 command, the card sets BSY within 400 ns.
Class 2. Upon receipt of a class 2 command, the card sets BSY within 400 ns, sets up
the sector buffer for a write operation, sets DRQ within 700 µs, and clears BSY within
400 ns of setting DRQ.
Class 3. Upon receipt of a class 3 command, the card sets BSY within 400 ns, sets up
the sector buffer for a write operation, sets DRQ within 20 ms (assuming no re-
assignments), and clears BSY within 400 ns of setting DRQ.
summarizes the CF-ATA command set with the paragraphs that follow describing
Initialize Drive Parameters
Execute Drive Diagnostic
CF-ATA command set
Read Verify Sector(s)
Check Power mode
Set Multiple mode
Set Sleep mode
Erase Sector(s)
Request Sense
Read Sector(s)
Idle immediate
Read Multiple
Identify Drive
Set Features
Read Buffer
Recalibrate
Command
Standby
Seek
NOP
Idle
(1)
E5h or 98h
E3h or 97h
E1h or 95h
20h or 21h
40h or 41h
E6h or 99h
E2h or 96h
Code
ECh
C0h
E4h
C4h
1Xh
7Xh
EFh
C6h
90h
91h
00h
03h
FR
Y
CF-ATA command description
SC
Y
Y
Y
Y
Y
Y
Y
SN
Y
Y
Y
Y
Y
CY
Y
Y
Y
Y
Y
DH
YD
D
D
D
D
Y
D
D
Y
Y
Y
D
D
Y
D
D
D
D
Y
LBA
Y
Y
Y
Y
Y
51/82