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Agenda:
Friday, August 22, 2014 Signal Description Of 8086
Signal Description Of 8086
Pin Configuration of 8086
Pin Purpose
1
Friday, August 22, 2014 Signal Description Of 8086 2
Signal Description of 8086
1. Available with 3 clock rates(viz. 5, 8 & 10 MHz)
2. 40 pin CERDIP or plastic package.
3. Operates in single as well as in multiprocessor configuration to achieve
high performance.
4. Some pins serves particular function in minimum mode & other
function in maximum mode.
5. Signal Category Groups
Signals with
common function
in both mode
Signals with
Special function
in minimum mode
Signals with
Special function
in maximum mode
Friday, August 22, 2014 Signal Description Of 8086 3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
GND
AD0-AD14
NMI
INTR
GND
VCC(+5V)
RESET
CLK
AD15
RD
MN/MX
RQ/GT0
LOCK
S1
S2
S0
QS0
TEST
READY
A16/S3
A17/S4
A18/S5
A19/S6
BHE/S7
RQ/GT1
QS1
8086
Interrupt
Control
Maximum Mode
Time
Multiplexed
memory
I/O address
& data lines
Time
Multiple
xed
address
& status
lines
Minimum Mode
HOLD
HLDA
WR
M/IO
DT/R
DEN
ALE
INTA
Friday, August 22, 2014 Signal Description Of 8086 4
Abbreviations
Maximum Mode
AD0-AD15 ≡ Address
GND ≡Ground
INTR ≡ Interrupt Return
CLK ≡ Clock Input
VCC ≡ Power Supply
BHE ≡ Bus High Enable
RD ≡ Read
INTR ≡ Interrupt Request
NMI ≡ Non Maskable Interrupt
MN/MX ≡ Min/Max
A16/S3, A17/S4, A18/S5, A19/S6 ≡ Multiplexed Address & Status Lines
Minimum Mode
M/I/O ≡ Memory I/O
INTA ≡ Interrupt Acknowledge
ALE ≡ Address Latch Enable
DT/R ≡ Data Transmit/Receive
DEN ≡ Data Enable
HLDA ≡ Hold Acknowledge
Friday, August 22, 2014 Signal Description Of 8086 5
Pin Purpose of 8086
1. Bus High Enable BHE – indicates transfer of data over high
order(D8-D15)
2. Clock Input CLK- Basic timing for processor operations &
bus control activity.
3. Reset – causes processor to stop current activity & start
execution from FFFFFH.
4. Vcc- Power supply for internal circuit operations.
5. GND- Ground for internal circuit.
Friday, August 22, 2014 Signal Description Of 8086 6
7. MN/MX- finds processors operating mode.
i.e. minimum or maximum mode.
8.Intrrupt Acknowledge INTA– Admit interrupt
9. Address Latch Enable ALE-Availability of valid
address on address/data lines, and is connected to
latch enable input of latches.
10. Test- This Input is examined by a ‘WAIT’
instructions, If TEST input goes low then execution
will continue else processor remain in an ideal state.
Cont’d…
Friday, August 22, 2014 Signal Description Of 8086 7
11. Hold Acknowledge HLDA- When HOLD line goes
high, it indicates to the processor that another master is
requesting the bus access.
12.Data Enable– Indicates availability of valid data over
address/ data lines.
13. Data Transmit/Receive DT/R-Used to decide the
direction of data flow through transreceiver. deal state.
Cont’d…

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Signal descriptors of 8086

  • 1. Agenda: Friday, August 22, 2014 Signal Description Of 8086 Signal Description Of 8086 Pin Configuration of 8086 Pin Purpose 1
  • 2. Friday, August 22, 2014 Signal Description Of 8086 2 Signal Description of 8086 1. Available with 3 clock rates(viz. 5, 8 & 10 MHz) 2. 40 pin CERDIP or plastic package. 3. Operates in single as well as in multiprocessor configuration to achieve high performance. 4. Some pins serves particular function in minimum mode & other function in maximum mode. 5. Signal Category Groups Signals with common function in both mode Signals with Special function in minimum mode Signals with Special function in maximum mode
  • 3. Friday, August 22, 2014 Signal Description Of 8086 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 GND AD0-AD14 NMI INTR GND VCC(+5V) RESET CLK AD15 RD MN/MX RQ/GT0 LOCK S1 S2 S0 QS0 TEST READY A16/S3 A17/S4 A18/S5 A19/S6 BHE/S7 RQ/GT1 QS1 8086 Interrupt Control Maximum Mode Time Multiplexed memory I/O address & data lines Time Multiple xed address & status lines Minimum Mode HOLD HLDA WR M/IO DT/R DEN ALE INTA
  • 4. Friday, August 22, 2014 Signal Description Of 8086 4 Abbreviations Maximum Mode AD0-AD15 ≡ Address GND ≡Ground INTR ≡ Interrupt Return CLK ≡ Clock Input VCC ≡ Power Supply BHE ≡ Bus High Enable RD ≡ Read INTR ≡ Interrupt Request NMI ≡ Non Maskable Interrupt MN/MX ≡ Min/Max A16/S3, A17/S4, A18/S5, A19/S6 ≡ Multiplexed Address & Status Lines Minimum Mode M/I/O ≡ Memory I/O INTA ≡ Interrupt Acknowledge ALE ≡ Address Latch Enable DT/R ≡ Data Transmit/Receive DEN ≡ Data Enable HLDA ≡ Hold Acknowledge
  • 5. Friday, August 22, 2014 Signal Description Of 8086 5 Pin Purpose of 8086 1. Bus High Enable BHE – indicates transfer of data over high order(D8-D15) 2. Clock Input CLK- Basic timing for processor operations & bus control activity. 3. Reset – causes processor to stop current activity & start execution from FFFFFH. 4. Vcc- Power supply for internal circuit operations. 5. GND- Ground for internal circuit.
  • 6. Friday, August 22, 2014 Signal Description Of 8086 6 7. MN/MX- finds processors operating mode. i.e. minimum or maximum mode. 8.Intrrupt Acknowledge INTA– Admit interrupt 9. Address Latch Enable ALE-Availability of valid address on address/data lines, and is connected to latch enable input of latches. 10. Test- This Input is examined by a ‘WAIT’ instructions, If TEST input goes low then execution will continue else processor remain in an ideal state. Cont’d…
  • 7. Friday, August 22, 2014 Signal Description Of 8086 7 11. Hold Acknowledge HLDA- When HOLD line goes high, it indicates to the processor that another master is requesting the bus access. 12.Data Enable– Indicates availability of valid data over address/ data lines. 13. Data Transmit/Receive DT/R-Used to decide the direction of data flow through transreceiver. deal state. Cont’d…