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): 88/141頁
文件大?。?/td> 1149K
代理商: BT849A
Bt848/848A/849A
Single-Chip Video Capture for PCI
Brooktree
78
E
LECTRICAL
I
NTERFACES
JTAG Interface
L848A_A
Optional Device ID
Register
The Bt848 has the optional device identification register defined by the JTAG spec-
ification. This register contains information concerning the revision, actual part
number, and manufacturers identification code specific to Brooktree. This register
can be accessed through the TAP controller via an optional JTAG instruction. Re-
fer to Table 15.
Verification with the Tap
Controller
A variety of verification procedures can be performed through the TAP controller.
With a set of four instructions, the Bt848 can verify board connectivity at all digital
interfaces and pins. The instructions are accessible by using a state machine stan-
dard to all JTAG controllers and are: Sample/Preload, Extest, ID Code, and Bypass
(see Figure 37). Refer to the IEEE P1149.1 specification for details concerning the
Instruction Register and JTAG state machine.
Brooktree has created a BSDL with the AT&T BSD Editor. Should JTAG test-
ing be implemented, a disk with an ASCII version of the complete BSDL file may
be obtained by calling 1-800-2Bt Apps.
NOTE:
Not all PCs drive the PCI bus TRST pin. In these computers, if the TRST
pin on the Bt848 board is connected to TRST on the PCI bus (which is not
driven) there is a potential that the Bt848 may power-up in an undefined
state. In these designs the TRST pin on the Bt848 must be grounded (dis-
abling JTAG).
Table 15. Device Identification Register
Version
Part Number
Manufacturer ID
X X X X 0 0 0 0 0 0 1 1 0 1 0 1 0 0 0 0 0 0 0 1 1 0 1 0 1 1 0 1
0
0848, 0x0350
0x0D6
4 Bits
16 Bits
11 Bits
Figure 37. Instruction Register
TDI
TDO
EXTEST
0
Sample/Preload
0
ID Code
0
Bypass
1
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