Seagate Medalist ST3636A Product Manual page 55

Register Addresses and Functions
This I/O map defines the register addresses and functions for these I/O
locations. For ease of reference, the commands are listed in alphabetical order.
Command:
Seagate Specific
Execute Drive Diagnostic
Identify Device
Init. Device Parameters
Power Commands
Read DMA
Read Multiple
Read Sector(s)
Read Sector Buffer
Read Verify Sector(s)
Recalibrate
Seek
Set Features
Set Multiple Mode
S.M.A.R.T.
Write DMA
Write Multiple
Write Sectors
Write Sector Buffer
where:
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Technical Reference Manual
Command Code
b7 b6 b5 b4
1 0 0
1 0 0
1 1 1
1 0 0
1 1 1
1 1 0
1 1 0
0 0 1
1 1 1
0 1 0
0 0 0
0 1 1
1 1 1
1 1 0
1 0 1
1 1 0
1 1 0
0 0 1
1 1 1
L is the long bit, if 1, R/W Long commands are executed, if 0, normal R/W
commands are performed.
r is the retry bit; 0 = retries are enabled, 1 = retries are disabled. Retries
that may be enabled/disabled are those on ECC and data errors. When
retries are disabled at the start of a command, they are always
automatically enabled at the end of the command.
SC is the sector count register.
SN is the sector number register.
CY are the cylinder registers.
DH is the device/head register.
FR is the features (write precomp) register.
y means the register contains a valid parameter for this command. For the
device/head register, y means that both the drive and head parameters are
used.
n means the register does not contain a valid parameter for this command.
b3 b2 b1 b0
1 1 0 1 0
1 0 0 0 0
0 1 1 0 0
1 0 0 0 1
0 0 p p p
0 1 0 0 r
0 0 1 0 0
0 0 0 L r
0 0 1 0 0
0 0 0 0 r
1 x x x x
1 x x x x
0 1 1 1 1
0 0 1 1 0
1 0 0 0 0
0 1 0 1 r
0 0 1 0 1
1 0 0 L r
0 1 0 0 0
Chapter 6
Parameters:
SC SN CY
DH
y y y d
n n n d
n n n d
y n n y
y n n d
y y y y
y y y y
y y y y
e n e d
y y y y
n n n d
n n y y
n n n d
y n n d
n n y d
y y y y
y y y y
y y y y
e n e d
Page 43
FR
n
n
n
n
n
n
n
n
n
n
n
n
y
n
y
n
n
n
n