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參數資料
型號: W83791D
廠商: WINBOND ELECTRONICS CORP
元件分類: 模擬信號調理
英文描述: W83791D Winbond H/W Monitoring IC
中文描述: SPECIALTY ANALOG CIRCUIT, PQFP48
封裝: LQFP-48
文件頁數: 18/46頁
文件大小: 636K
代理商: W83791D
W83791D
Preliminary
Publication Release Date: Aug, 2001
Revision 0.41
11
(b) Serial bus read from a register
0
D7
D6
D5
D4
D3
D2
D1
D0
Ack
Mby
Ack
by
791D
SCL
SDA
7
8
0
7
8
0
Frame 4
Data Byte
Frame 3
Serial Bus Address Byte
Figure 2. Serial Bus Read from Internal Address Register
Stop by
Master
0
Start By
Master
0
1
0
1
1
0
1
D7
D6
D5
D4
D3
D2
D1
D0
R/W
Ack
by
791D
SCL
SDA
7
8
0
7
8
0
Frame 2
Internal Index Register Byte
Frame 1
Serial Bus Address Byte
Ack
by
791D
( Conti nued)
( Conti nued)
0
1
0
1
1
0
1
R/W
Repeat
by
Master
6.3 Speech Function
6.3.1
General Description
The W83791D is a derivative of Winbond's
PowerSpeech
TM
synthesizers. There are up to 5 hardware trigger
inputs, 17 Hardware Monitor event and 128 programmable software event trigger inputs. If more than two events
happen simultaneously, the priority set by the internal H/W is: SLOTOCC# > EVNTRAP1 > EVNTRAP2 >
EVNTRAP3 > EVNTRAP4 > EVNTRAP5 > TRIGREG(Index 09h) 128 events > VIN0 > VIN1> others (VIN2 –
VIN9,TEMP, FAN, case open). Software trigger is able to accommodate 128 event triggers, with timeout register
(index 08h) enabled in advance for allowance of time on detecting devices. That is, once the system’s power is on,
BIOS can fill trigger event and speech voice will not be sent till the system fails owing to timeout. In addition, to
prevent events from taking place simultaneously.
6.3.2
Event Trigger Queue
W83791D provides 8 byte FIFO queue to store event trigger, i.e, the first 8 event can be served by speech
and speech will clear FIFO queue after service. Coding of Speech program must assign correct CPU_MODE event
vector to issue correct speech voices correspondent to speech trigger events. For example, CPU_MODE event
vector =1 represents absence of CPU, then coding speech with CPU is absent voice. When W83791D detects no
CPU exists, it will send vector = 1 to speech synthesizer and play this voice data. Following is the block diagram of
the 8-Byte event trigger queue.
8-bit Counter
Trigger
Timeout Register
(Index 08h)
CLK 1 HZ
Timeout
Comparator
TREvent
Trigger Data
(Index 09h, b6~0)
Enable Timeout
(Index 0Ah, b6)
8-Byte Event Trigger Queue
Figure 3. Event trigger Queue
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