SPECIFICATIONS
Copyright 2001
A-1
DAC128V HARDWARE REFERENCE
A.1 Specifications
MECHANICAL
Measurements............................................ 1.800 inches x 3.900 inches x 0.303 inches
(above board),
4.572 cm x 9.906 cm x 0.770 cm
Weight........................................................ 1.056 oz., 29.93 grams
Board thickness ......................................... 0.062 inches, 0.157 cm, nominally,
(4 layer)
PROTOCOL
Clock rate................................................... 8 MHz
Wait cycles................................................. None on any transfer types
Hold cycles ................................................ Supported on all valid transfer types
Address decoding ...................................... Complete (no partial)
I/O transfers
Writes .................................................. 16-bit
Reads................................................... 16-bit
I/O locations .............................................. Eight, 16-bit
Ports .................................................... 8
Maximum read/write rate.................... 4 MTransfers/second, sustained
ID transfers ................................................ 8-bit read (only)
Zero-fill on upper byte
12 bytes, including CRC
Systran’s manufacturer’s .................... ID = 0x45, = E
ASCII
DAC128V’s model number................. 0x69, = i
ASCII
Cyclic Redundancy Check value ........ 0xE8
Maximum read rate ............................. 4 MTransfers/second, sustained
Memory transfers....................................... Not supported
Interrupt Vector transfers........................... Not supported
Interrupt requests ....................................... None generated
DMA activity ............................................. Not supported
Acknowledgment on
unsupported transfer attempts ................... None generated
Memory read and write
Interrupt read
ID write, and addresses beyond those needed for valid transfers
POWER-UP DEFAULT CONDITION
All data registers power up at mid-scale (I/O read of ‘0x0800’)
No accesses permitted or acknowledged during RESET
POWER REQUIREMENTS
Power:........................................................ +5 Vdc @ 24 mA (typical no load)
+12 Vdc @ 24 mA (typical no load)
-12 Vdc @ 22 mA (typical no load)
PERFORMANCE CHARACTERISTICS
Electrical Characteristics: Refer to Chapter 4, PERFORMANCE
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Содержание DAC128V
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