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參數資料
型號: 1215E
英文描述: TEST/JTAG SUPPORT|CMOS|QFP|48PIN|PLASTIC
中文描述: 測試/ JTAG支持|的CMOS | QFP封裝| 48PIN |塑料
文件頁數: 40/92頁
文件大小: 1041K
代理商: 1215E
Agere Systems Inc.
45
User Manual
April 2001
Advanced Operational Mode
497AE and 1215E Boundary-Scan Master 2
Appendix B—BSM2 Register Descriptions (continued)
CUTO: Control-USEROUT0/TAP Function/Output Enable Register (continued)
TOEB
(TDO Output Enable Control Bit)—In applications in which the TAP output signals must be 3-stated, a
user has the option of selecting this function either through hardware (TOE* pin in 1215E) or software
(using the TOEB bit). The value of the TOEB bit is ORed with the inverted value of the BSM2 TOE*
pin (in the 1215E) and with a constant 0 (in the 497AE). When the resulting value (TOEB_internal) is
1, all TAP output pins of the BSM2 except TDO are enabled. TDO is enabled in two ways:
1. In the TAP Manual Mode, both TOEB_internal and TDOEM must be in their active states (1 in both
cases).
2. When not in the TAP Manual Mode, the automatic enable/disable of TDO described in the Stan-
dard is in effect when TOEB_internal has the value 1.
The TOEB bit in the 1215E gives the user the option of either software or hardware control over the
TAP output enable/disable function. This function may be especially useful if the user plans to switch
or share TAP buses.
Note:
In the 497AE, the TAP outputs will never be enabled (not in any mode) unless the TOEB bit is set.
This is because there is no TOE* pin on the 497AE to give a hardware option for TAP output enable
control. There is no BSM2 internal sanity check for this item. It is the user’s responsibility.
TDOM
(TDO Control Bit for TAP Manual Mode)—In TAP Manual Mode, the value of this bit is the next value
of the signal to be driven on the BSM2 TDO pin. The value is driven following a write of the CUT0 reg-
ister according to the section titled Control of TDI, TDO, TMS, and TRST* pins.
TMSM
(TMS Control Bit for TAP Manual Mode)—In TAP Manual Mode, the value of this bit is the next value
of the signal to be driven on the BSM2 TMS pin. The value is driven following a write of the CUT0 reg-
ister according to the section titled Control of TDI, TDO, TMS, and TRST* pins.
TDOEM
(TAP Output Enable Control Bit for TDO in TAP Manual Mode)—This bit is only active in TAP Manual
Mode. When the value of this bit is 1, the TDO signal is enabled if the TOEB bit is also active (above).
The BSM2 does not check for sanity in TAP Manual Mode. The user is responsible for enabling TDO
only at desired/appropriate times.
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