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參數(shù)資料
| 型號(hào)： | TMS279XN |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | FLOPPY DISK FORMATTERICONTROLLER FAMILY |
| 中文描述： | 軟盤驅(qū)動(dòng)FORMATTERICONTROLLER家庭 |
| 文件頁數(shù)： | 3/40頁 |
| 文件大小： | 334K |
| 代理商： | TMS279XN |
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TMS279X (WD279X) FLOPPY DISK FORMATTER / CONTROLLER FAMILY
3
PIN
NUMBER
18
PIN NAME
SYMBOL
FUNCTION
READ PULSE WIDTH
RPW
An external potentiometer tied to this input controls the phase
comparator within the data separator.
22
TEST#
TEST#
A logic low on this input allows adjustment of external resistors
by enabling internal signals to appear on selected pins.
23
PUMP
PUMP
High-Impedance output signal which is forced high or low to
increase / decrease the VCO frequency
25
ENABLE
MINI-FLOPPY
(2791,2793)
ENMF#
A logic low on this input enables an internal divide by 2 of the
Master Clock. This allows both 51/4" and 8" drive operation with
a single 2 MHz clock. For a 1 MHz clock on Pin 24, this line
must be left open or tied to a Logic 1.
25
SIDE SELECT
OUTPUT
(2795,2797)
SSO
The logic level of the Side Select Output is directly controlled by
the 'S' flag in Type 11 or III commands. When U = 1, SSO is set
to a logic 1. When U = 0, SSO is set to a logic 0. The SSO is
compared with the compare Status Bit 4 (RNF) is set. The Side
Select Output is only updated at the beginning of a Type II or III
command. It is forced to a logic 0 upon a MASTER RESET
condition.
26
VOLTAGE-
CONTROLLED
OSCILLATOR
VCO
An external capacitor tied to this pin adjusts the VCO center
frequency
27
RAW READ#
RAW RD#
The data input signal directly from the drive. This input shall be
a negative pulse for each recorded flux transition.
28
HEAD LOAD
HLD
The HLD output controls the loading of the Read- Write head
against the media.
29
TRACK GREATER
THAN 43
TG43
This output informs the drive that the Read/Write head is
positioned between tracks 44-76. This output is valid only
during Read and Write Commands.
This output is made valid before writing is to be performed on
the diskette.
MFM or FM output pulse per flux transition. WD contains the
unique Address marks as well as data and clock in both FM and
MFM formats.
30
WRITE GATE
WG
31
WRITE DATA
WD
32
READY
READY
This input indicates disk readiness and is sampled for a logic
high before Read or Write commands are performed. If Ready
is low the Read or Write operation is not performed and an
interrupt is generated. Type I operations are performed
regardless of the state of Ready. The Ready input appears in
inverted format as Status Register bit 7.
33
WRITE PRECOMP
WIDTH
WPW
An external potentiometer tied to this input controls the amount
of delay in Write precompensation mode.
34
TRACK 00#
TR00#
This input informs the TMS279X that the Read/Write head is
positioned over Track 00.
35
INDEX PULSE#
IP#
This input informs the TMS279X when the index hole is
encountered on the diskette.
This input is sampled whenever a Write Command is received.
A logic low terminates the command and sets the Write Protect
Status bit.
36
WRITE PROTECT#
WPRT#
NOTE: A trailing # replaces the overbar means the symbol is active low.
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