參數(shù)資料
型號: SCANPSC100F
廠商: National Semiconductor Corporation
英文描述: Embedded Boundary Scan Controller(嵌入式邊界掃描控制器)
中文描述: 嵌入式邊界掃描控制器(嵌入式邊界掃描控制器)
文件頁數(shù): 13/25頁
文件大?。?/td> 364K
代理商: SCANPSC100F
Serial Scan Interface (SSI)
(Continued)
The PRPG is loaded by four PPI writes to the TDO address.
When the PRPG enable bit is set, a pulse is issued internally
that initializes the local parallel load logic such that the
PRPG is loaded sequentially, least significant byte first, most
significant byte last. When in PRPG mode, writes can be
completed at any time; however, shift operations will be dis-
abled until the PRPG is fully loaded.
LOOP AROUND MODE
. This mode, enabled by setting bit
0 in Mode Register 0, will cause data appearing at the TDI in-
put to be placed directly back on the TDO output. This fea-
ture can be used for read-only scan operations where data is
shifted into TDI while returning the scan chain to its previous
state when shifting is completed. It can also be used to by-
pass PSC100 devices connected within a boundary scan
chain (i.e., a PSC100 located within a chain, but not provid-
ing the JTAG TAP data). Loop around has limited usefulness
in most boundary scan applications since, typically, data in
the scan chain is shifted out and evaluated as new data is
shifted into the chain for the next test.
DS100325-11
FIGURE 11. TDO Shifter/Buffer Block Diagram Register Hookup
DS100325-14
FIGURE 12. TDO PRPG Block Diagram
www.national.com
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