MPC5200 datasheet(74/80 Pages) FREESCALE

74 / 80 page

MPC5200 Data Sheet, Rev. 4

System Design Information

Freescale Semiconductor

5.3.2

Pull-up Requirements for the PCI Control Lines

If the PCI interface is NOT used (and internally disabled) the PCI control pins must be terminated as

indicated by the PCI Local Bus specification [4]. This is also required for MOST/Graphics and Large Flash

Mode.

PCI control signals always require pull-up resistors on the motherboard (not the expansion board) to

ensure that they contain stable values when no agent is actively driving the bus. This includes

PCI_FRAME, PCI_TRDY, PCI_IRDY, PCI_DEVSEL, PCI_STOP, PCI_SERR, PCI_PERR, and

PCI_REQ.

5.3.3

Pull-up/Pull-down Requirements for MEM_MDQS pins

(SDRAM)

The MEM_MDQS[3:0] signals are not used with SDR memories and require pull-up or pull-down

resistors in SDRAM mode.

5.4

JTAG

The MPC5200 provides the user an IEEE 1149.1 JTAG interface to facilitate board/system testing. It also

provides a Common On-Chip Processor (COP) Interface, which shares the IEEE 1149.1 JTAG port. The

COP Interface provides access to the MPC5200's imbedded Freescale (formerly Motorola) MPC603e

G2_LE processor. This interface provides a means for executing test routines and for performing software

development & debug functions.

5.4.1

JTAG_TRST

Boundary scan testing is enabled through the JTAG interface signals. The JTAG_TRST signal is optional

in the IEEE 1149.1 specification but is provided on all processors that implement the PowerPC

architecture. To obtain a reliable power-on reset performance, the JTAG_TRST signal must be asserted

during power-on reset.

5.4.1.1

JTAG_TRST and PORRESET

The JTAG interface can control the direction of the MPC5200 I/O pads via the boundary scan chain. The

JTAG module must be reset before the MPC5200 comes out of power-on reset; do this by asserting

JTAG_TRST before PORRESET is released.

For more details refer to the Reset and JTAG Timing Specification.

MPC5200 数据表(PDF) 74 Page - Freescale Semiconductor, Inc

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