Intel 80C186XL, 80C188XL user manual Index-2

INDEX

and chip-selects, 6-5 HALT state, exiting, 3-30 idle states, 3-18 instruction prefetch, 3-20

interrupt acknowledge (INTA) cycles, 3-6, 3-25–3-26, 8-9

and chip-selects, 6-5 interrupt acknowledge cycles, 8-29 operation, 3-7–3-20

priorities, 3-44–3-45, 7-2 read cycles, 3-20–3-21 refresh cycles, 3-22, 7-4, 7-5

control signals, 7-5, 7-6

during HOLD, 3-41–3-43, 7-12–7-13 wait states, 3-13–3-18

write cycles, 3-22–3-25 See also Data transfers Bus hold protocol, 3-39–3-44

and CLKOUT, 5-6 and CSU, 6-18

and refresh cycles, 3-41–3-43, 7-12–7-13 and reset, 5-9

latency, 3-40–3-41

Bus Interface Unit (BIU), 2-1, 2-3, 2-11, 3-1–3-45 and DMA, 10-8

and DRAM refresh requests, 7-4 and TCU, 9-1

buffering the data bus, 3-34–3-36 modifying interface, 3-33–3-36, 3-36 relationship to RCU, 7-1

synchronizing software and hardware events, 3-36–3-37

using a locked bus, 3-37–3-38

using multiple bus masters, 3-39–3-44 using the queue status signals, 3-38–3-39

BX register, 2-1, 2-5, 2-30

C

Carry Flag (CF), 2-7, 2-9 Chip-Select Unit (CSU), 6-1

and DMA, 10-8

and DMA acknowledge signal, 10-22 and HALT bus cycles, 3-28

and READY, 6-15–6-16 and wait states, 6-15–6-16 block diagram, 6-3

bus cycle decoding, 6-17

Index-2

examples, 6-18–6-22 features and benefits, 6-1 functional overview, 6-2–6-5 programming, 6-6–6-17 registers, 6-6–6-12

system diagram, 6-19 See also Chip selects

Chip-selects activating, 6-5

and 80C187 interface, 6-17, 10-11 and bus hold protocol, 6-18

and DMA acknowledge signal, 10-22 and DRAM controllers, 7-1

and reserved I/O locations, 6-17 initializing, 6-6–6-18 methods for generating, 6-1 overlapping, 6-16–6-17 programming considerations, 6-17 start address, 6-17

timing, 6-4

CL register, 2-5, 2-21, 2-22

CLKOUT

and bus hold, 5-6

and power management modes, 5-6 and reset, 5-6

Clock divider, 5-11 control register, 5-12

Clock generator, 5-6–5-10 and system reset, 5-6–5-7 output, 5-6

synchronizing CLKOUT and RESOUT, 5-6– 5-7

Clock sources, TCU, 9-12 Code (programs)‚ See Software Code segment, 2-5 CompuServe forums, 1-6

Counters‚ See Timer Counter Unit (TCU) CPU, block diagram, 2-2

Crystal‚ See Oscillator

CS register, 2-1, 2-5, 2-6, 2-13, 2-23, 2-39, 2-41 Customer service, 1-4

CX register, 2-1, 2-5, 2-23, 2-25, 2-26

D

Data, 3-6

Data bus, See Address and data bus

Data segment, 2-5