Table 2.6 Transfer Mode Setup Request From Hdd To Init - Fujitsu MBA3073 SERIES Technical Manual

Table 2.6
Message from HDD
SDTR MESSAGE REJECT
REQ/ACK Offset = X'7F'
Transfer Period = X'0A'
(25 ns)
(LVD mode)
Transfer
Period =
X'0C' (50 ns)
(SE mode)
S
D
T
R
*1 If the INIT responds to these values during transfer period with non-zero and REQ/ACK offset,
the HDD sends the MESSAGE REJECT message following the INIT's SYNCHRONOUS
TRANSFER REQUEST message and forcibly switches the synchronous transfer mode to the
asynchronous transfer mode.
C141-C015
Transfer mode setup request from HDD to INIT
(SDTR: SYNCHRONOUS DATA TRANSFER REQUEST message)
Response from INIT
REQ/ACK X'00'
Offset X'01'
:
X'7F'
X'80'
:
Transfer Period X'00'
:
X'09'
X'0A' (25 ns)
X'0B' (50.0 ns) Synchronous mode
X'0C' (50 ns)
X'0D'
:
X'12' (72 ns)
X'13' (76 ns)
:
X'19'(100 ns)
X'1A' (104 ns)
:
X'1F' (124 ns)
X'20' (128 ns)
:
X'25' (148 ns)
X'26' (152 ns)
:
X'2B' (172 ns)
X'2C' (176 ns)
:
X'32' (200 ns)
X'33' (204 ns)
:
X'FF' (1020 ns)
Transfer mode to be defined
Asynchronous mode
Asynchronous mode
Synchronous mode
REQ/ACK offset < Specified value by INIT
REQ/ACK offset= X'7F'
Synchronous mode (40.0 MB/s max.) 8-bit mode
(80.0 MB/s max.) 16-bit mode
REQ Period > 25 ns
ACK Period > 25 ns
Synchronous mode (40.0 MB/s max.) 8-bit mode
(80.0 MB/s max.) 16-bit mode
REQ Period > 25 ns
ACK Period > Specified value by Init
(20.0 MB/s max.) 8-bit mode
(40.0 MB/s max.) 16-bit mode
REQ Period > 50.0 ns
ACK Period > Specified value by Init
Synchronous mode (20.0 MB/s max.) 8-bit mode
(40.0 MB/s max.) 16-bit mode
REQ Period > 50 ns
ACK Period > Specified value by INIT
Synchronous mode (13.3 MB/s max.) 8-bit mode
(26.6 MB/s max.) 16-bit mode
REQ Period > 75 ns
ACK Period > Specified value by INIT
Synchronous mode (10.0 MB/s max.) 8-bit mode
(20.0 MB/s max.) 16-bit mode
REQ Period > 100 ns
ACK Period > Specified value by INIT
Synchronous mode (8.00 MB/s max.) 8-bit mode
(16.0 MB/s max.) 16-bit mode
REQ Period > 125 ns
ACK Period > Specified value by INIT
Synchronous mode (6.67 MB/s max.) 8-bit mode
(13.33 MB/s max.) 16-bit mode
REQ Period > 150 ns
ACK Period > Specified value by INIT
Synchronous mode (5.71 MB/s max.) 8-bit mode
(11.42 MB/s max.) 16-bit mode
REQ Period > 175 ns
ACK Period > Specified value by INIT
Synchronous mode (5.00 MB/s max.) 8-bit mode
(10.00 MB/s max.) 16-bit mode
REQ Period > 200 ns
ACK Period > Specified value by INIT
Asynchronous mode (*1)
175