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參數(shù)資料
| 型號(hào)： | 82C237 |
| 廠商： | Intersil Corporation |
| 英文描述： | CMOS High Performance Programmable DMA Controller |
| 中文描述： | 高性能的CMOS可編程DMA控制器 |
| 文件頁數(shù)： | 22/25頁 |
| 文件大?。?/td> | 158K |
| 代理商： | 82C237 |
4-169
82C237
FIGURE 12. DMA TRANSFER
NOTE: For 16-bit mode, 82C237 only. In 8-bit mode this signal is always high impedance three-stated. Waveform shown is for an 8-bit transfer
with the 82C237 programmed in 16-bit mode. For a 16-bit transfer, DWLE will go low at least TASS before the falling edge of ADSTB in S2,
and remain low for the entire transfer.
Timing Waveforms
(Continued)
TEPW (21)
TAK (9)
SI
SI
TQS
(30)
S0
S0
S1
S2
S3
S4
S2
S3
S4
SI
SI
SI
TDQ
(18)
THS
(25)
TAEL
(1)
TCLSH
(33)
TQS
(30)
TCL (13)
TCY
(14)
TCH
(12)
TDQ
(18)
TAET
(2)
TSHSL
(37)
TCLSL
(34)
TEPS
(20)
TEPH
(19)
TRHAL
(58)
TAK (9)
TAFAB (3)
TAHW (8)
TAHR (6)
TRHDI (63)
TAFC (4)
TDCTR (16)
(56)
(15)
TRLRH
(36)
CLK
DREQ
HRQ
HLDA
AEN
ADSTB
DB0-DB7
A0-A7
DACK
READ
WRITE
INT EOP
EXT EOP
(64)
TAZRL
TAFDB
(5)
TFAAB
(22)
TFADB
(24)
TASS
(11)
TAHS
(7)
A8-A15
TAK
(9)
TDCL
(15)
TFAC
(23)
TDCL (15)
TDVWL
(62)
TWLWHA
(38)
TDCTW
(17)
TAVWL
(57)
TDVAL (61)
(FOR EXTENDED WRITE)
(FOR EXTENDED WRITE)
TAK (9)
TDCL
(15)
TWLWH (39)
TDCTW (17)
TWRRD
(35)
TAVRL
TDCTR
(16)
TAHR
(6)
TAHW
(8)
ADDRESS VALID
TASM
(10)
ADDRESS VALID
TAHS
(7)
TASS
(11)
DWLE
(SEE NOTE)
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| 82C25 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:VOLTAGE DETECTORS |
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