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UM8272A-4 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - Floppy Disk Controller - UMC

भाग संख्या UM8272A-4
समारोह Floppy Disk Controller
मैन्युफैक्चरर्स UMC 
लोगो UMC लोगो 
पूर्व दर्शन
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<?=UM8272A-4?> डेटा पत्रक पीडीएफ

UM8272A-4 pdf
UM8272A /UM8272A.4
provides control signals which simplify the design of an
external phase locked 10QP and write precompensation
circuitry; . The FDC simplifies and handles most of the
burdens associated with implementing a Floppy Disk Drive
interface. The UM8272A IS a pin-compatible upgrade to
the 8272.
Hand-Shaking signals are provided in the UM8272A which
make DMA operation easy to incorporate with the aid of
an external DMA Controller chip. The FDC will operate'
in either DMA or Non-DMA mode. In the Non-DMA mode,
the FDC generates interrupts to the processor every time a
data byte is available. In the DMA mode, the processor
need only load the command into the FDC and all data
transfers occur under control of the UM8272A and DMA
controller.
There are 15 separate commands which the UM8272A
will .execute. Each of these commands requires multiple
8-bit bytes to fully specify the operation which the
processor wishes the FDC to perform. The following com-
mands are available:
Read Data
Read ID
Read Deleted Data
Read a Track
Scan Equal
Scan High or Equal
Scan Low or Equal
Specify
Write Data
Format a Track
Write Deleted Data
Seek
Recalibrate (Restore to Track 0)
Sense interrupt Status
Sense Drive Status
Address mark detection circuitry is internal to the FDC
which simplifies the phase locked loop and read electronics.
The track stepping rate, head load time, and head unload
time may be programmed by the user. The UM8272A
offers many additional features such as multiple sector
transfers in both read and write with a single command,
and full IBM compatibility in both single and double
density models.
MEMORIES
}
/~
BDO_7
MEMR
lOR
MEMW
lOW
CS
HRO
HLDA
~7
DMA
CONTROLLER
DRO
DACK
TC
TERMINAL
COUNT
8080 SYSTEM BUS
/~
(
AO
DBO_7
RD
WR
CS
INT
RESET
READ
l-rV DATA
WINDOW
I PLL
RD DATA
UM8272A
WR DATA
DRIVE
A
/
"-'"
INPUT CONTROL
INTERFACE
/OUTPUT CONTROL "-"-
Figure 1. System Configuration
6-4

विन्यास 21 पेज
डाउनलोड[ UM8272A-4 Datasheet.PDF ]


शेयर लिंक


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भाग संख्याविवरणविनिर्माण
UM8272A-4Floppy Disk ControllerUMC
UMC


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