Intel SA-1100 Boundary-Scan Interface Timing, Symbol Parameter Minimum Typical Maximum Units

Boundary-Scan Test Interface

Table 16-1shows the SA-1100 boundary-scan interface timing specifications.

Table 16-1. SA-1100 Boundary-Scan Interface Timing

Symbol	Parameter	Minimum	Typical	Maximum	Units	Notes
Tbscl	TCK low period	50	–	–	ns	8
Tbsch	TCK high period	50	–	–	ns	8
Tbsis	TDI,TMS setup to [TCr]	10	–	–	ns	–
Tbsih	TDI,TMS hold from [TCr]	10	–	–	ns	–
Tbsoh	TDO hold time	5	–	–	ns	1
Tbsod	TCf to TDO valid	–	–	40	ns	1
Tbsss	I/O signal setup to [TCr]	5	–	–	ns	4
Tbssh	I/O signal hold from	20	–	–	ns	4
	[TCr]
Tbsdh	Data output hold time	5	–	–	ns	5
Tbsdd	TCf to data output valid	–	–	40	ns	–
Tbsoe	TDO enable time	5	–	–	ns	1,2
Tbsoz	TDO disable time	–	–	40	ns	1,3
Tbsde	Data output enable time	5	–	–	ns	5,6
Tbsdz	Data output disable time	–	–	40	ns	5,7
Tbsr	Reset period	30	—	—	ns	—
Tbsrs	TMS setup to [TRr]	10	—	—	ns	8
Tbsrh	TMS hold from [TRr]	10	—	—	ns	8

NOTES:

1.Assumes a 25-pF load on TDO. Output timing derates at 0.072 ns/pF of extra load applied.

2.TDO enable time applies when the TAP controller enters the Shift-DR or Shift-IR states.

3.TDO disable time applies when the TAP controller leaves the Shift-DR or Shift-IR states.

4.For correct data latching, the I/O signals (from the core and the pads) must be set up and held with respect to the rising edge of TCK in the CAPTURE-DR state of the SAMPLE/PRELOAD and EXTEST instructions.

5.Assumes that the data outputs are loaded with the ac test loads.

6.Data output enable time applies when the boundary-scan logic is used to enable the output drivers.

7.Data output disable time applies when the boundary scan is used to disable the output drivers.

8.TCK may be stopped indefinitely in either the low or high phase.

SA-1100 Developer’s Manual 16-9