參數(shù)資料
型號(hào)： AM53C96KC
廠商： ADVANCED MICRO DEVICES INC
元件分類： 總線控制器
英文描述： High Performance SCSI Controller
中文描述： SCSI BUS CONTROLLER, PQFP100
封裝： 35 MM, CARRIER RING, PLASTIC, QFP-100
文件頁數(shù)： 22/63頁
文件大小： 455K
代理商： AM53C96KC
P R E L I M I N A R Y
AMD
22
Am53C94/Am53C96
SCSI Timeout Register (05H) Write
SCSI Timeout Register
STIMREG
7
Address: 05
H
Type: Write
0
6
5
4
3
2
1
STIM7
STIM6
STIM5
STIM4
STIM3
STIM2
STIM1
STIM0
x
x
x
x
x
x
x
x
16506C-23
This register determines how long the initiator (target)
will wait for a target to respond to a selection (reselec-
tion) before timing out. It should be set to yield 250 ms to
comply with ANSI standards for SCSI.
STIMREG – Bits 7:0 – STIM 7:0 – SCSI Timer 7:0
The value loaded in STIM 7:0 can be calculated from the
following formula:
STIM 7:0 =
[(SCSI Time Out) (Clock Frequency) / (8192 (Clock
Factor))]
Example:
SCSI Time Out (in seconds): 250 ms. (Recommended
by the ANSI Standard) = 250 x 10
–3
s.
Clock Frequency: 20 MHz. (assume) = 20 x 10
6
Hz.
Clock Factor: CLKF 2:0 from Clock Conversion Regis-
ter (09H) = 5
STIM 7:0 = (250 x 10
–3
)
X (20 x 10
6
) / (8192 (5)) = 122
decimal
Internal State Register (06H) Read
Internal State Register
ISREG
Address: 06
H
Type: Read
7
6
5
4
3
2
1
0
RES
RES
RES
RES
SOF
IS2
IS1
IS0
x
x
x
x
0
0
0
0
Reserved
Reserved
Reserved
Reserved
Synchronous Offset Flag
Internal State 2:0
16506C-24
The Internal State Register (ISREG) tracks the progress
of a sequence-type command. It is updated after each
successful completion of an intermediate operation. If
an error occurs, the host can read this register to deter-
mined at where the command failed and take the neces-
sary procedure for recovery. Reading the Interrupt
Status Register will clear this register.
ISREG – Bits 7:4 – RES – Reserved
ISREG – Bit 3 –
SOF
– Synchronous Offset Flag
The SOF is reset when the Synchronous Offset Register
(SOFREG) has reached its maximum value.
Note:
The SOF bit is active Low.
ISREG – Bits 2:0 – IS 2:0 – Internal State 2:0
The IS 2:0 bits along with the Interrupt Status Register
(INSTREG) indicates the status of the successfully
completed intermediate operation. Refer to the Status
Decode section for more details.
相關(guān)PDF資料
PDF描述
AM53C96KCW High Performance SCSI Controller
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AM80C286 Circular Connector; No. of Contacts:10; Series:MS27508; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:12; Circular Contact Gender:Socket; Circular Shell Style:Box Mount Receptacle RoHS Compliant: No
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