- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385939 > TMS279X (Texas Instruments, Inc.) FLOPPY DISK FORMATTERICONTROLLER FAMILY PDF資料下載
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： | 軟盤驅(qū)動(dòng)FORMATTERICONTROLLER家庭 |
| 文件頁數(shù)： | 13/40頁 |
| 文件大?。?/td> | 334K |
| 代理商： | TMS279X |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁當(dāng)前第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁
TMS279X (WD279X) FLOPPY DISK FORMATTER / CONTROLLER FAMILY
13
When both HLD and HLT are true, the 279X will then read from or write to the media. The AND of HLD and
HLT appears as status bit 5 in Type I status.
In summary, for Type I commands: if h = 0 and V = 0, HLD is reset. If h = 1 and V = 0, HLD is set at the
beginning of the command and HLT is not sampled nor is there an internal 15 ms delay. If h = 0 and V = 1,
HLD is set near the end of the command, an internal 15 ms occurs, and the 279X waits for HLT to be true. If
h = 1 and V = 1, HLD is set at the beginning of the command. Near the end of the command, after all the
steps have been issued, an internal 15 ms delay occurs and the 279X then waits for HLT to occur.
For Type II and III commands with E flag off, HLD is made active and HLT is sampled until true. With E flag
on, HLD is made active, an internal 15 ms delay occurs and then HLT is sampled until true.
restore (seek track 0)
Upon receipt of this command, the track 00 (TR00) input is sampled. If TR00 is active low, indicating the
read-write head is positioned over track 0, the track register is loaded with zeroes and an interrupt is
generated. If TR00 is not active low, stepping pulses at a rate specified by the r1 r0 field are issued until the
TR00 input is activated. At this time the track register is loaded with zeroes and an interrupt is generated. If
the TR00 input does not go active low after 255 stepping pulses, the 279X terminates operation, interrupts,
and sets the seek error status bit. A verification operation takes place if the V flag is set. The h bit allows the
head to be loaded at the start of command. Note that the Restore command is executed when M R goes
from an active to an inactive state.
seek
This command assumes that the track register contains the track number of the current position of the
read-write head and the data register contains the desired track number. The TMS279X will update the track
register and issue stepping pulses in the appropriate direction until the contents of the track register are
equal to the contents of the data register (the desired track location). A verification operation takes place if
the V flag is on. The h bit allows the head to be loaded at the start of the command. An interrupt is generated
at the completion of the command. Note: when using multiple drives, the track register must be updated for
the drive selected before seeks are issued.
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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。