參數(shù)資料
型號: BT849A
英文描述: Single-Chip Video Capture for PCI
中文描述: 單芯片的PCI視頻捕捉
文件頁數(shù): 99/141頁
文件大?。?/td> 1149K
代理商: BT849A
Brooktree
89
C
ONTROL
R
EGISTER
D
EFINITIONS
Interrupt Line, Interrupt Pin, Min_Gnt, Max_Lat Register
L848A_A
Bt848/848A/849A
Single-Chip Video Capture for PCI
Interrupt Line, Interrupt Pin, Min_Gnt, Max_Lat Register
PCI Configuration Header Location 0x3C
Min_Gnt and Max_Lat values are dependent on target performance (TRDY) and video mode (scale factors and color
format). These values were chosen for best case target (0 wait-state) and worst-case video delivery (full-resolution
32-bit RGB).
Bits
Type
Default
Name
Description
[31:25]
RO
0x28
Max_Lat
Require bus access every 8.5
μ
S, at a minimum, in units of
250nS. Affects the desired settings for the latency timer value.
[24:16]
RO
0x10
Min_Gnt
Desire a minimum grant burst period of 4
μ
S to empty data FIFO,
in units of 250nS. Affects the desired settings for the latency timer
value. Set for 128 dwords, with 0 wait states.
[15:8]
RO
0x01
Interrupt Pin
Bt848 interrupt pin is connected to INTA, the only one usable by a
single function device.
[7:0]
RW
Interrupt Line
The Interrupt Line register communicates interrupt line routing
information between the POST code and the device driver. The
POST code initializes this register with a value specifying to which
input (IRQ) of the system interrupt controller the Bt848 interrupt
pin is connected. Device drivers can use this value to determine
interrupt priority and vector information.
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