參數(shù)資料
型號(hào)： TMS279X
廠商： Texas Instruments, Inc.
英文描述： FLOPPY DISK FORMATTERICONTROLLER FAMILY
中文描述： 軟盤(pán)驅(qū)動(dòng)FORMATTERICONTROLLER家庭
文件頁(yè)數(shù)： 6/40頁(yè)
文件大?。?/td> 334K
代理商： TMS279X
TMS279X (WD279X) FLOPPY DISK FORMATTER / CONTROLLER FAMILY
6
When executing the Seek command, the data register holds 5e address of the desired track position. This
register is loaded from the DAL and gated onto the DAL under processor control.
track register
This 8-bit register holds the track number of the current read/write head position. It is incremented by one
every time the head is stepped in (towards track 76) and decremented by one when the head is stepped out
(towards track 00). The contents of the register are compared with the recorded track number in the ID field
during disk read, write and verify operations. The track register can be loaded from or transferred to the DAL.
This register should not be loaded when the device is busy.
sector register (SR)
This 8-bit register holds the address of the desired sector position. The contents of the register are compared
with the recorded sector number in the ID field during disk read or write operations. The sector register
contents can be loaded from or transferred to the DAL. This register should not be loaded when the device is
busy.
command register (CR)
This 8-bit register holds the command presently being executed. This register should not be loaded when the
device is busy unless the new command is a force interrupt. The command register can be loaded from the
DAL, but not read onto the DAL.
status register (STR)
This 8-bit register holds device status information. The meaning of the status bits is a function of the type of
command previously executed. This register can be read onto the DAL, but not loaded from the DAL.
CRC logic
This logic is used to check or to generate the 16-bit cyclic redundancy check (CRC). The polynomial is:
G(x) = x16 + x12 + x5 + 1.
The CRC includes all information starting with the address mark and up to the CRC characters. The CRC
register is preset to ones prior to data being shifted through the circuit.
arithmetic/logic unit (ALU)
The ALU is a serial comparator, incrementer, and decrementer and is used for register modification and
comparisons with the disk recorded ID field.
timing and control
All computer and floppy disk interface controls are generated through this logic. The internal device timing is
generated from an external crystal clock.
AM detector
The address mark detector detects ID, data and index address marks during read and write operations.
write precompensation
Enables write precompensation to be performed on the double-density write data output.
data separator
A high-performance phase-lock-loop data separator with on-chip VCO and phase comparator allows
adjustable frequency range for 5" or 8" floppy disk interfacing.
相關(guān)PDF資料
PDF描述
TMS279XN FLOPPY DISK FORMATTERICONTROLLER FAMILY
TMS27C040-15 Programmable Read-Only Memory(512K×8結(jié)構(gòu),可擦可編程只讀存儲(chǔ)器)
TMS27C256-150 Programmable Read-Only Memory(32K×8結(jié)構(gòu),可擦可編程只讀存儲(chǔ)器)
TMS27C512-150 Programmable Read-Only Memory(64K×8結(jié)構(gòu),可擦可編程只讀存儲(chǔ)器)
TMS28F512A(中文) Flash Electrically Erasable Programmable Read-Only Memory(64K×8結(jié)構(gòu),可擦可編程閃速只讀存儲(chǔ)器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TMS279XN 制造商:TI 制造商全稱:Texas Instruments 功能描述:FLOPPY DISK FORMATTERICONTROLLER FAMILY
TMS27C/PC256-10 制造商:TI 制造商全稱:Texas Instruments 功能描述:TMS27C256 32768 BY 8-BIT UV ERASABLE TMS27PC256 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES
TMS27C/PC256-12 制造商:TI 制造商全稱:Texas Instruments 功能描述:TMS27C256 32768 BY 8-BIT UV ERASABLE TMS27PC256 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES
TMS27C/PC256-15 制造商:TI 制造商全稱:Texas Instruments 功能描述:TMS27C256 32768 BY 8-BIT UV ERASABLE TMS27PC256 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES
TMS27C/PC256-17 制造商:TI 制造商全稱:Texas Instruments 功能描述:TMS27C256 32768 BY 8-BIT UV ERASABLE TMS27PC256 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES
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