FN2980.2 February 27, 2006 TABLE 1. SUMMARY OF 82C89 MODES, REQUESTING AND RELINQUISHING THE MULTI-MASTER SYSTEM BUS SINGLE LINES FROM 80C86 OR " />
參數(shù)資料
型號(hào)： CP82C89
廠商： Intersil
文件頁(yè)數(shù)： 13/13頁(yè)
文件大?。?/td> 0K
描述： IC ARBITER BUS 5V 8MHZ 20-DIP
標(biāo)準(zhǔn)包裝： 180
控制器類型： CMOS 優(yōu)先中斷控制器
電源電壓： 4.5 V ~ 5.5 V
電流 - 電源： 1mA
工作溫度： 0°C ~ 70°C
安裝類型： 通孔
封裝/外殼： 20-DIP（0.300"，7.62mm）
供應(yīng)商設(shè)備封裝： 20-PDIP
包裝： 管件
9
FN2980.2
February 27, 2006
TABLE 1. SUMMARY OF 82C89 MODES, REQUESTING AND RELINQUISHING THE MULTI-MASTER SYSTEM BUS
SINGLE LINES FROM
80C86 OR 80C88 OR 8088
IOB MODE
ONLY
IOB = LOW
RESB = LOW
RESB MODE ONLY
IOB = HIGH, RESB = HIGH
IOB MODE RESB MODE
IOB = LOW, RESB = HIGH
SINGLE BUS
MODE
IOB = HIGH
RESB = LOW
S2
S1
S0
SYSB/RESB =
HIGH
SYSB/RESB =
LOW
SYSB/RESB =
HIGH
SYSB/RESB =
LOW
I/O
Commands
0
1
0
1
0
X
X
Halt
0
1
X
XXXX
X
Memory
Commands
1
0
1
0
1
0
X
X
Idle
1
X
XXXX
X
NOTES:
1. X = Multi-Master System Bus is allowed to be Surrendered.
2. = Multi-Master System Bus is Requested.
MODE
PIN
STRAPPING
MULTI-MASTER SYSTEM BUS
REQUESTED**
SURRENDERED*
Single Bus Multi-Master Mode
IOB = High RESB =
Low
Whenever the processor’s status lines go
active
HLT + TI CBRQ + HPBRQ
RESB Mode Only
IOB = High RESB =
High
SYSB/RESB + High
ACTIVE STATUS
(SYSB/RESB = Low + TI)
CBRQ + HLT + HPBRQ
IOB Mode Only
IOB = Low
RESB = Low
Memory Commands
(I/O Status + TI) CBRQ + HLT +
HPBRQ
IOB Mode RESB Mode
IOB = Low
RESB = High
(Memory Command)
(SYSB/RESB = High)
(I/O Status Commands) +
SYSB/RESB = Low) CBRQ +
HPBRQ + HLT
NOTES:
*LOCK prevents surrender of Bus to any other arbiter, CRQLCK prevents surrender of Bus to any lower priority arbiter.
** Except for HALT and Passive or IDLE Status.
HPBRQ, Higher priority Bus request or BPRN = 1.
1. IOB Active Low.
2. RESB Active High.
3. + is read as “OR” and as “AND”
4. TI = Processor Idle Status S2, S1, S0 = 111
5. HLT = Processor Halt Status S2, S1, S0 = 011
82C89
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