Datasheet

Signal Description
2-20 MCF5206e USER’S MANUAL MOTOROLA
2.16 TEST SIGNALS
2.16.1 Motorola Test Mode (MTMOD)
This input signal chooses between the debug and JTAG signals that are multiplexed
together. When MTMOD=1, the MCF5206e is in Debug mode and when MTMOD=0, the
MCF5206e is in JTAG mode.
2.16.2 High Impedance (HIZ)
The assertion of the HIZ input signal forces all output drivers to a high-impedance state
(three-state). The timing on HIZ is independent of the clock. Note that HIZ does not
override JTAG operation; TDO/DSO can be forced to a high-impedance state by asserting
TRST.
If RSTI
and HIZ are asserted simultaneously, the MCF5206e enters master reset mode.
In this reset mode, the entire MCF5206e (including the DRAM controller refresh circuitry)
is reset. You must use master reset for all power-on resets.
If RSTI
is asserted while HIZ is negated, the MCF5206e enters normal reset mode. In this
reset mode, the DRAM controller refresh circuitry is not reset and continues to generate
refresh cycles at the programmed rate.
2.17 SIGNAL SUMMARY
Table 2-12 provides a summary of the electrical characteristics of the MCF5206e signals.
Table 2-12. MCF5206e Signal Summary
SIGNAL NAME MNEMONIC INPUT/OUTPUT ACTIVE STATE RESET STATE
Address[27:24]/Chip Select[7:4]/
Write Enable[0:3]
A[27:24]/
CS
[7:4]/
WE[0:3]
In,Out/
Out/
Out
-/
Low/
Low
Three-stated/
Negated/
Negated
Address A[23:0] In,Out - Three-stated
Data D[31:0] In,Out - Three-stated
Chip Select[3:0] CS
[3:0] Out Low Negated
Interrupt Priority Level/ Interrupt
Request
IPL[2]/IRQ[7]
IPL
[1]/IRQ[4]
IPL
[0]/IRQ[1]
In/In Low -
Read/Write R/W In,Out - Three-stated
Size SIZ[1:0] In,Out - Three-stated
Transfer Type TT[1:0] Out - Three-stated
Access Type & Mode ATM Out - Three-stated
Transfer Start TS
In,Out Low Three-stated
Transfer Acknowledge TA
In,Out Low Three-stated
Asynchronous Transfer
Acknowledge
ATA
In Low -
Transfer Error Acknowledge TEA
In Low -
Bus Request BR
Out Low Negated
Bus Grant BG
In Low -
Fr
eescale S
emiconduct
or
, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
nc...