P R E L I M I N A R Y
INT2/INTA0/PWD/PIO31 ................................................................................................ 24
INT3/INTA1/IRQ ............................................................................................................. 24
INT4/PIO30 .................................................................................................................... 25
LCS/ONCE0/RAS0 ........................................................................................................ 25
MCS0/PIO14 .................................................................................................................. 25
MCS1/UCAS/PIO15 ....................................................................................................... 25
MCS2/LCAS/PIO24 ....................................................................................................... 25
MCS3/RAS1/PIO25 ....................................................................................................... 26
NMI ................................................................................................................................ 26
PCS1/PIO17, PCS0/PIO16 ............................................................................................ 26
PCS2/CTS1/ENRX1/PIO18 ........................................................................................... 27
PCS3/RTS1/RTR1/PIO19 .............................................................................................. 27
PCS5/A1/PIO3 ............................................................................................................... 27
PCS6/A2/PIO2 ............................................................................................................... 28
PIO31–PIO0 (Shared) .................................................................................................... 28
RD .................................................................................................................................. 28
RES ................................................................................................................................ 28
RTS0/RTR0/PIO20 ........................................................................................................ 30
RXD0/PIO23 .................................................................................................................. 30
RXD1/PIO28 .................................................................................................................. 30
S2/BTSEL ...................................................................................................................... 30
S1–S0 ............................................................................................................................ 30
S6/CLKDIV2/PIO29 ....................................................................................................... 30
SRDY/PIO6 .................................................................................................................... 30
TMRIN0/PIO11 ............................................................................................................... 31
TMRIN1/PIO0 ................................................................................................................ 31
TMROUT0/PIO10 .......................................................................................................... 31
TMROUT1/PIO1 ............................................................................................................ 31
TXD0/PIO22 ................................................................................................................... 31
TXD1/PIO27 ................................................................................................................... 31
UCS/ONCE1 .................................................................................................................. 31
UZI/PIO26 ...................................................................................................................... 31
V
................................................................................................................................ 31
CC
WHB ............................................................................................................................... 31
WLB ............................................................................................................................... 32
WR ................................................................................................................................. 32
X1 ................................................................................................................................... 32
X2 ................................................................................................................................... 32
FUNCTIONAL DESCRIPTION .................................................................................................. 33
Memory Organization ..................................................................................................... 33
I/O Space ....................................................................................................................... 33
BUS OPERATION ..................................................................................................................... 34
BUS INTERFACE UNIT ............................................................................................................. 36
Nonmultiplexed Address Bus ......................................................................................... 36
DRAM Address Multiplexing .......................................................................................... 36
Programmable Bus Sizing ............................................................................................. 37
Byte-Write Enables ........................................................................................................ 37
Data Strobe Bus Interface Option .................................................................................. 37
DRAM INTERFACE ................................................................................................................... 37
PERIPHERAL CONTROL BLOCK ............................................................................................ 38
Reading and Writing the PCB ........................................................................................ 38
Am186ED/EDLV Microcontrollers
5
AMD [ AMD ]
