AN1769 Freescale Semiconductor / Motorola, AN1769 Datasheet - Page 4

• Manufacturer Part Number: AN1769
• Description: Designing a Minimal PowerPC System
• Manufacturer: Freescale Semiconductor / Motorola

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The MPC750 has additional signals for interfacing with a back-side L2 cache ( L2ADDR[0Ð16] ,
L2DATA[0Ð63] , L2DP[0Ð7] , L2CE , L2WE , L2CLK_OUTA , L2CLK_OUTB , L2SYNC_OUT ,
L2SYNC_IN , and L2ZZ ). Because the L2 interface is completely separate from the system bus, it does not
affect the design of a minimal system in any way. Refer to the MPC750 RISC Microprocessor Hardware
SpeciÞcations , or the MPC750 Processor/Cache Module Hardware Manual , for further details.
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AP(0Ð3), APE, BR, CKSTP_OUT, CI, CLKOUT,
CSE(0Ð1), DP(0Ð7), DPE, HALTED, QREQ, RSRV,
TC(0Ð2), TMS, TDI, TDO, VOLTDETGND, WT
CKSTP_IN, DBWO, DBDIS, DRVMOD1, RUN,
SHD, SRESET, TBEN, TLBISYNC, XATS
L1_TSTCLK, LSSD_MODE
ABB, ARTRY, DBB, GBL, L2_TSTCLK,TCK
BG, DBG, DRVMOD0, L2_INT
DRTRY
QACK
PLL_CFG(0Ð3)
INT, MCP, SMI
VDD, OVDD
AVDD, L2AVDD
HRESET
TRST
SYSCLK
A(0Ð31), AACK, TA, TEA, TBST, TS, TSIZ(0Ð2),
TT(0Ð4)
DH(0Ð31), DL(0Ð31)
This table combines MPC603x, MPC604x, and MPC750 processors. Not all of these signals are present on
These signals are the only ones that need consideration in a minimal system design. All others are assigned
every device.
Þxed values and can be safely ignored thereafter.
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Signal
Freescale Semiconductor, Inc.
Table 1. PowerPC Bus Signal Connections
For More Information On This Product,
Minimal PowerPC System Design
Go to: www.freescale.com
Unused, leave unconnected.
Unused, pullup or connect to VDD (+3.3V).
Unused, connect directly to VDD (+3.3V).
Unused, connect to 10K pullup to VDD (+3.3V).
Connect to ground.
Connect to HRESET
Connect to 1K pulldown to ground.
Connect to VDD (+3.3V) or ground to conÞgure CPU speed.
Connect to VDD pullup (+3.3V) and/or interrupt controller.
Connect to appropriate voltage level.
Connect to PLL Þlter as shown in hardware reference
manual.
Connect to reset controller.
Connect to reset controller, or connect to 1K pulldown (GND).
Connect to clock generator.
Connect to memory controller.
Connect to memory devices.
Treatment
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MOTOROLA