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ISCC
User Manual
UM011002-0808
4
Figure 1–2. Pin F
unctions
Page 4 of 316
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User Manual
1
Revision History
3
Table of Contents
4
1.1 INTRODUCTION
7
Page 2 of 316
8
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1.3 Pin Description
12
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2.1 Introduction
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2.2.3 Data Transfers
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2.3.1 Polling
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2.3.2 Interrupts
21
2.3.3 DMA Interrupts
22
2.4 REGISTER ACCESS
23
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24
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2.4.4 DMA Cell Registers
28
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Support Circuitry
32
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3.3 BAUD RATE GENERATOR
34
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3.4 DATA ENCODING/DECODING
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3.6 CLOCK SELECTION
46
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3.7 CRYSTAL OSCILLATORS
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4.2 ASYNCHRONOUS MODE
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4.2.1 Asynchronous Transmit
56
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WR4 0,1 select parity
64
WR5 1 RTS
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2 select CRC generator
64
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4.4.1 SDLC Transmit
76
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WR4 1-0 Select parity
79
WR5 2 Select CRC-CCITT
79
4.4.2 SDLC Receive
80
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4.4.3 SDLC LOOP MODE
86
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5.1 INTRODUCTION
92
5.2 REGISTER DESCRIPTIONS
92
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5.2.3 DMA Registers
94
5.4 WRITE REGISTERS
95
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Mode Definition)
100
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Constant)
120
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5.5 READ REGISTERS
126
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5.5.2 Read Register 1
129
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5.5.3 Read Register 2
131
5.5.4 Read Register 3
132
5.5.5 Read Register 8
133
5.5.6 Read Register 10
133
5.5.7 Read Register 12
134
5.5.8 Read Register 13
134
5.5.9 Read Register 15
135
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5.6.2 DMA Status Register
137
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5.6.7 DMA Enable Register
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5.6.8 DMA Control Register
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UM011002-0808
149
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Customer Support
154
PPLICATION
155
Write Cycle Timing
157
INPUT/OUTPUT CYCLES
159
Z80A CPU to Z8500 Peripherals
159
INPUT/OUTPUT CYCLES
160
(Continued)
160
Z90H CPU TO Z8500 PERIPHERALS
164
INTERRUPT ACKNOWLEDGE CYCLES
169
EXTERNAL INTERFACE LOGIC
169
CPU/Peripheral Same Speed
169
Z8500/Z8500A Peripherals
171
Software
176
Interfacing Z80
177
INTRODUCTION
178
INTERFACES
179
Z180 to Memory Interface
179
EPROM INTERFACE
181
'74 '74
184
Z180 TO I/O INTERFACE
185
(Continued)
189
SCC Interrupt Operation
189
Z180 MPU to SCC Interface
191
SCC I/O Read/Write Cycle
191
USING EPLD
196
Application Note
198
Page 192 of 316
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CONCLUSION
210
GENERAL DESCRIPTION
211
GENERAL DESCRIPTION
212
Processor
212
Address Map
213
UM011001-0601
216
IUSC (Continued)
220
SERIAL INTERFACING
220
JUMPER SUMMARY
225
DMA/EPLD LOGIC
226
DMA/EPLD LOGIC (Continued)
228
YNCHRONOUS
231
OMMUNICATIONS
231
SYNCHRONOUS MODES
232
SYSTEM INTERFACE
232
CONTROL BUS
233
EPROM CONTROL BUS
233
RAM CONTROL BUS
233
ADDRESS/DATA BUS
233
SYSTEM INTERFACE
234
INITIALIZATION
235
INITIALIZATION
236
APPENDIX
238
SOFTWARE ROUTINES
238
RECEIVE ROUTINE
240
TRANSMIT ROUTINE
241
RECEIVE INT. SERVICE ROUTINE
242
SDLC TRANSMIT
245
SDLC RECEIVE
247
/W//REQ (In /REQ mode)
249
ONLY MODE
251
Master SCC
253
Slave SCC #1
253
Slave SCC #2
253
Slave SCC #n
253
DATA TRANSFER MODES
256
SDLC PROTOCOL
257
TRANSMIT OPERATION
262
RECEIVE OPERATION
262
SOFTWARE
265
RECEIVE OPERATION
267
ESCC/SCC DIFFERENCES
269
ESCC SYSTEM BENEFITS
271
TRANSMIT FIFO INTERRUPT
272
RECEIVE FIFO INTERRUPT
273
AUTOMATIC /RTS DEASSERTION
274
MODIFIED WRITE TIMING
280
HARDWARE CONFIGURATION
284
TRANSMITTING A LLAP FRAME
286
RECEIVING LLAP FRAMES
286
CONCLUSIONS
287
APPENDIX A
288
APPENDIX B
298
SCILLATOR
301
Quartz Equivalent Circuit
303
Symbolic Representation
303
Load Capacitors
305
Amplifier Characteristics
305
Signal Line
308
Layout Should
308
Avoid High
308
Lighted Areas
308
NTERFACING
311
CONFIGURING THE BUS
315
APPLICATIONS EXAMPLES
318
ONTROLLER
321
ISCC QUESTIONS AND ANSWERS
322
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