MPC8378CVRAGGA datasheet(56/126 Pages) FREESCALE

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MPC8378E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

JTAG

11.3.2.1

High-Speed Read Meeting Setup (Maximum Delay)

The following equations show how to calculate the allowed combined propagation delay range of the

SD_CLK and SD_DAT/CMD signals on the PCB.

tCLK_DELAY + tDATA_DELAY + tODLY + tSHSIVKH < 1.5 × tSHSCK

tCLK_DELAY + tDATA_DELAY < 1.5 × tSHSCK – tODLY – tSHSIVKH

This means that Data + Clock delay can be up to 11 ns for a 20 ns clock cycle:

tCLK_DELAY + tDATA_DELAY < 30 – 14 – 5

tCLK_DELAY + tDATA_DELAY < 11

11.3.2.2

High-Speed Read Meeting Hold (Minimum Delay)

The following equations show how to calculate the allowed combined propagation delay range of the

SD_CLK and SD_DAT/CMD signals on the PCB.

0.5

× t

SHSCK < tCLK_DELAY + tDATA_DELAY + tOH – tSHSIXKH + tINT_CLK_DLY

0.5

× tSHSCK – tOH + tSHSIXKH – tINT_CLK_DLY < tCLK_DELAY + tDATA_DELAY

This means that Data + Clock delay must be greater than ~6 ns for a 20 ns clock cycle:

10 – 2.5 + (-1.5) < tCLK_DELAY + tDATA_DELAY

6 < tCLK_DELAY + tDATA_DELAY

11.3.2.3

High-Speed Read Combined Formula

The following equation is the combined formula to calculate the propagation delay range of the SD_CLK

and SD_DAT/CMD signals on the PCB.

0.5

× tSHSCK – tOH + tSHSIXKH < tCLK_DELAY + tDATA_DELAY < 1.5 × tSHSCK – tODLY – tSHSIVKH

12 JTAG

This section describes the DC and AC electrical specifications for the IEEE 1149.1 (JTAG) interface of

the MPC8378E.

12.1

JTAG DC Electrical Characteristics

Table 48 provides the DC electrical characteristics for the IEEE 1149.1 (JTAG) interface of the

MPC8378E.

Table 48. JTAG interface DC Electrical Characteristics

Parameter

Symbol

Condition

Min

Max

Unit

Input high voltage

VIH

—2.5

OVDD +0.3

Input low voltage

VIL

—–0.3

0.8

Input current

IIN

——

±30

μA

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