Datasheet

Electrical Specifications
9-8 Intel
®
E8870 Scalable Node Controller (SNC) Datasheet
For specifications related to components or external tools that will interface with the SNC
components, refer to that component or tool’s associated specification.
9.7.1 DC Specifications
Table 9-13. SMBus and TAP Interface Signal Group
Signal Group Signal
SMBus
(I/O) SPDCLK, SPDDA, SCL, SDA
TAP
(Input) TCK, TDI, TMS, TRST#
TAP
(Output) TDO
Table 9-14. TAP Signal Terminations
a,b
a. Termination values for input pins are based on requirements of Intel’s in-target
probe. Requirements for other applications may differ.
b. All resistances are nominal with a tolerance allowance of ±5%.
TCK 27-ohm to GND
TMS 39-ohm to VCC
TDI
c
c. This TDI pull-up value applies only to TDI inputs driven by Intel’s in-target probe
TAP controller.
150-ohm to VCC
TDO, TDI 75-ohm to VCC
TRST# 500 to 680-Ohm to GND
Table 9-15. TAP DC Parameters
a
a. All specifications are at the pin of the package.
Symbol Parameter Min Max Unit Notes
Vil Input Low Voltage -0.4 0.76 V
Vih Input High Voltage 1.16 1.8 V
V
T
- Negative-going Threshold Voltage 0.76 1.03 V
b
b. See Figure 9-1
V
T
+ Positive-going Threshold Voltage 0.91 1.16 V
b
V
H
Hysteresis Voltage 130 mV
b
Vol Output Low Voltage 0.34 0.49 V
c
c. Measured with a 75-ohm ±10% test load to Vcc.
I
li
Input Leakage Current 50 µA
c
I
ol
Output Low Current 12.7 mA
c