參數(shù)資料
型號: CD1284
廠商: Intel Corp.
英文描述: IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports
中文描述: 符合IEEE 1284兼容并行接口控制器兩個高速異步串行端口
文件頁數(shù): 147/176頁
文件大?。?/td> 2255K
代理商: CD1284
IEEE 1284-Compatible Parallel Interface Controller
CD1284
Datasheet
147
14-bit counter is started (from 0x00). It counts up until either the expected event occurs or the
count matches the value in HTVR. If a match occurs, a timeout condition exists. The HTVR need
only be loaded once, typically during device initialization.
The value placed in HTVR yields an approximate one second count time, based on the value of the
input CLK. For example, if the system clock driving the device is 25 MHz, the HTVR should be
loaded with 0xC0. The following equation provides an example.
The computed value is rounded up to the next largest whole hex value, in this case
0x3000
. Load
the HTVR with the most-significant 8 bits of this value, left-shifted two places since HTVR is a 14-
bit counter. This results in a value of
0xC0
. For 20 MHz, the value is computed to be
0x9C
; for
16 MHz, the value is
0x7C
; values for other clocks can be easily computed in the same manner.
At reset, the HTVR defaults to a value of
0xFF
; this prevents the extremely short timeouts that
occur if the register is cleared at device reset and is not initialized.
A timeout causes a negotiation status change interrupt. This status is displayed as
0x22
in the
NSR (NSR[5] and the code for return to Compatibility mode
0010
in the result code field).
When Compatibility mode is reentered, the port control state machine waits in a locked state until
signals on the parallel port return to normal Compatibility mode conditions.
For debug purposes, disable the host timeout timer by setting PCR[3:2] (HTmrTst[1:0]). In this
case, no timeouts occur and the link can hang indefinitely while waiting for a host-generated event.
7.8.3
Input Value Register
This register always shows the current state of the external handshake pins.
25
MHz
2048
------------------
12207
10
2
FAF
16
=
=
Register Name: IVR
Register Description: Input Value
Access: Read only
Bit 7
0
8-Bit Hex Address: 2E
Default Value: XX
Bit 6
0
Bit 5
0
Bit 4
0
Bit 3
A1284
Bit 2
nInit
Bit 1
HstBsy
Bit 0
HstClk
Bit
Description
7:4
These bits are not used and return
0
when read.
3
A1284
2
nInit
(low active Init input)
1
HstBsy
(host busy)
0
HstClk
(host clock)
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