Signal Characteristics; Connector Pi Pin Assignments - Intel iSBC 86/14 Hardware Reference Manual

PREPARATION FOR USE
2-30. Signal Characteristics
As
shown in Figure 1-1, connector PI interfaces the iSBC 86/14/30 board
to the Multibus interface. Connector PI pin assignments are listed in
Table 2-19 and descriptions of the signal functions are provided in Table
2-20.
Signal names indicate the active state of the signal on the Multibus
interface.
If the sign~l name ends with a slash
(I),
the signal is
active when LOW; if the signal does not end with a slash, the signal is
active when HIGH.
DC characteristics for the PI interface on the iSBC 86/14/30 board are
provided in Table 2-21. Tables 2-22 and 2-23 contains the ac
characteristics for the PI interface when the board is operating as a bus
master and as a bus slave. Each parameter in the ac characteristics
appears on the bus master or bus slave mode timing diagrams shown in
Figure 2-7 and Figure 2-8.
Table 2-19. Connector PI Pin Assignments
(COMPONENT SIDE)
(CIRCUIT SIDE)
PIN* MNEMONIC DESCRIPTION
PIN* MNEMONIC DESCRIPTION
1 GND Signal GND 2 GND Signal GND
3
+5V
+5 Vdc
4
+5V +5 Vdc
POWER 5 +5V
+5 Vdc 6
+5V
+5 Vdc
SUPPLIES 7
+12V
+12 Vdc 8 +12V +12 Vdc
9 Reserved 10
Reserved
11
GND Signal GND
12
GND
Signal GND
13 BCLKI
Bus Clock 14 INITI
Initalize
15 BPRNI Bus Priority In
16 BPROI Bus Priority Out
BUS 17 BUSyl
Bus Busy
18
BREQI Bus Request
CONTROLS
19
MRDCI Mem Read Cmd
20 MWTCI
Mem Write Cmd
21 IORCI
1/0
Read Cmd
22
IowCI
1/0
Write Cmd
23 XACKI XFER Acknowledge
24
INH11 Inhibit 1 Disable
RAM
25 LOCKI Bus Lock 26
Reserved
BUS
27 BHENI Byte High Enable
28 AD101
CONTROLS 29 CBRQI
Common Bus Request
30 ADllI
Address
AND 31 CCLKI Cons tant Clk
32 AD121
Bus
ADDRESS 33 INTA
Interrupt Ack
34 AD131
2-51