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HS-82C37 数据表(PDF) 24 Page - Harris Corporation

部件名 HS-82C37
功能描述  Radiation Hardened CMOS High Performance Programmable DMA Controller
Download  28 Pages
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制造商  HARRIS [Harris Corporation]
网页  http://www.harris.com
标志 HARRIS - Harris Corporation

HS-82C37 数据表(HTML) 24 Page - Harris Corporation

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24
HS-82C37ARH
Command Register - This 8-bit register controls the
operation of the HS-82C37ARH. It is programmed by the
microprocessor and is cleared by Reset or a Master Clear
instruction. The adjacent table lists the function of the
command bits. See Figure 10 for Read and Write addresses.
Command Register
76543210
0
1
0
1
BIT NUMBER
MEM-TO-MEM DISABLE
MEM-TO-MEM ENABLE
CH. 0 ADDR. HOLD DISABLE
CH. 0 ADDR. HOLD ENABLE
IF BIT 0 = 0
X
0
1
CONTROLLER ENABLE
CONTROLLER DISABLE
0
1
NORMAL TIMING
COMPRESSED TIMING
IF BIT 0 = 1
X
0
1
FIXED PRIORITY
ROTATING PRIORITY
0
1
LATE WRITE SELECTION
EXTENDED WRITE SEL.
IF BIT 3 = 1
X
0
1
DREQ SENSE ACTIVE HIGH
DREQ SENSE ACTIVE LOW
0
1
DACK SENSE ACTIVE LOW
DACK SENSE ACTIVE HIGH
Status Register - The Status Register contains information
about the present status of the HS-82C37ARH and can be
read by the microprocessor. This information includes which
channels have reached a terminal count and which channels
have pending DMA requests. Bits 0-3 are set every time a
TC is reached by that channel or an external EOP is applied.
These bits are cleared upon Reset, Master Clear, and on
each Status Read. Bits 4-7 are set whenever their corre-
sponding channel is requesting service, regardless of the
mask bit state. If the mask bits are set, software can poll the
Status Register to determine which channels have DREQs,
and selectively clear a mask bit, thus allowing user defined
service priority. Status bits 4-7 are updated while the clock is
high, and latched on the falling edge. Status Bits 4-7 are
cleared upon Reset or Master Clear.
Status Register
Temporary Register - The Temporary Register is used to
hold data during Memory-to-Memory transfers. Following the
completion of the transfer, the last word moved can be read
by the microprocessor by accessing this register. The Tem-
porary Register always contains the last byte transferred in
the previous Memory-to-Memory operation, unless cleared
by a Reset or Master Clear.
76543210
1
1
1
1
1
1
BIT NUMBER
CHANNEL 0 HAS REACHED TC
CHANNEL 1 HAS REACHED TC
CHANNEL 2 HAS REACHED TC
CHANNEL 3 HAS REACHED TC
CHANNEL 0 REQUEST
CHANNEL 1 REQUEST
1
1
CHANNEL 2 REQUEST
CHANNEL 3 REQUEST
OPERATION
A3
A2
A1
A0
IOR
IOW
Read Status Register
100001
Write Command Register
100010
Read Request Register
100101
Write Request Register
100110
Read Command Register
101001
Write Single Mask Bit
101010
Read Mode Register
101101
Write Mode Register
101110
Set Byte Pointer F/F
110001
Clear Byte Pointer F/F
110010
Read Temporary Register
110101
Master Clear
110110
Clear Mode Reg. Counter
111001
Clear Mask Register
111010
Read All Mask Bits
111101
Write All Mask Bits
111110
FIGURE 10. SOFTWARE COMMAND CODES AND REGISTER CODES
Spec Number
518058


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