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參數(shù)資料
| 型號： | W9966TF |
| 文件頁數(shù)： | 16/44頁 |
| 文件大小： | 278K |
| 代理商： | W9966TF |
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Prel i m nary -16- November 1997
W9966CF/TF
Video Camera Interface Controller with Compression
7.3PC Interface
The W9966CF/TF supports industrial standard SPP/EPP/ECP for PC interface. It also supports
device ID in Nibble Mode reverse channel transfer. The following interface signals, according to IEEE
P1284 standard, are redefined in SPP/EPP/ECP modes:
TABLE 7.2 PARALLEL PORT REDEFINED SIGNALS
SIGNAL (DRIVEN)
SPP
EPP
ECP
NSTB# (Host)
nStrobe
nWrite
HostClk
NAFD# (Host)
nAutoFd
nDStrb
HostAck
NINIT# (Host)
nInit
nInit
nReverseRequest
NSLCT# (Host)
nSelectIn
nAStrb
1284 Active
NACK# (Peripheral)
nAck
Intr
PeriphClk
BUSY (Peripheral)
Busy
nWait
PeriphAck
PERR (Peripheral)
PError
User Defined 1
nAckReverse
NFAULT# (Peripheral)
nFault
User Defined 2
nPeriphRequest
SEL (Peripheral)
Select
User Defined 3
Xflag
Note:
in EPP mode, PERR signal is re-defined as DATA FIFO empty status (active high), NFAULT# signal is re-defined as DATA
FIFO full status (active high), and SEL signal is re-defined as DATA FIFO half full status (active high).
7.3.1Negotiation
The interface is always initialized to the SPP mode. Host may reinitialize the interface at any time by
asserting nInit (NINIT#) low conjunction with nSelectIn (NSLCT#) low. The W9966CF/TF returns to
the Compatibility Mode Idle phase after initialization.
A P1284 compliant host negotiates with the W9966CF/TF to verify that the W9966CF/TF is P1284
compliant. Upon the verification the host will request a communication mode for the W9966CF/TF.
The W9966CF/TF will acknowledge the request for communication mode based on its capabilities
and execute or reject the request as appropriate. This is accomplished by the host placing an
extensibility request value on the data bus during the negotiation phase. Table 7.3 shows the
communication modes supported by the W9966CF/TF.
TABLE 7.3 W9966CF/TF COMMUNICATION MODES AND THEIR EXTENSIBILITY REQUEST VALUES
MODE DEFINITION
EXTENSIBILITY REQUEST VALUE
Request EPP Mode
0100 0000
Request ECP Mode
0001 0000
Request Device ID Using Nibble Mode Rev Chan
Transfer
0000 0100
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| W9966CF | Video Camera Interface Controller With Compression(運用壓縮技術(shù)的攝像照相機接口控制器) |
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