Specifications
HARDWARE PREPARATION AND INSTALLATION
2-8 MPC505EVBUM/D
2.2.6 System Clock Selection Headers (J6 and J7)
Jumper headers J6 and J7 let you define the system clock source. The factory configuration
(shown below) is for normal operation; a fabricated jumper on J6 and J7 pins 1 and 2. Refer to
Table 2-4 for configuring the system clock source.
Table 2-4. System Clock Source Configuration
MODCLK (J6)
Jumper Settings
VDDSYN (J7)
Jumper Settings
System Phase-Lock-
Loop Options
1 and 2 (default) 1 and 2 (default) Normal Operation
2 and 3 1 and 2 1:1 Mode
1 and 2 2 and 3 SPLL Bypass Mode
2 and 3 2 and 3 Special Test Mode
J7
3
2
1
Fabricated Jumpers
J6
3
2
1
HARDWARE PREPARATION AND INSTALLATION
MPC505EVBUM/D 2-9
2.2.7 EVB LED Descriptions
There are three LEDs on the EVB. Their functions are:
• LD1 – 3.3 Vdc power: ON = 3.3 Vdc power is applied to the EVB.
• LD2 – Debug Mode: ON = MPC505 is in debug mode
• LD3 – +5 Vdc power: ON = power is applied to the EVB.
2.2.8 Optional Memory Configuration
There are eight 52-pin PLCC sockets on the EVB (U19, U20, U21, U22, U29, U30, U31, and
U32) for synchronous static RAM (SSRAM) devices. These sockets are paired as upper and
lower words and organized for long-word (32 bits wide) data transfers. Each pair is refered to as
BANKx. Table 2-5 shows on-board, memory configuration options.
Table 2-5. Optional Memory Configuration
Bank Upper Word Lower Word 64Kb Memory
Part Numbers
128Kb Memory
Part Numbers
BANK1 U29 U19 MCM67M518 MCM67M618
BANK2 U30 U20 MCM67M518 MCM67M618
BANK3 U31 U21 MCM67M518 MCM67M618
BANK4 U32 U22 MCM67M518 MCM67M618
The SSRAM factory default for the EVB is 128 kilobytes (two 64Kb I.C.s) installed in BANK1
(U19 and U29). You may increase the amount of on-board SSRAM to 256 kilobytes by
increasing the memory in sockets U19 and U29. You can further expand on-board memory by
populating U20, U21, U22, U30, U31, and U32 with additional SSRAM devices in each bank.
The EVB can have up to 1 megabyte of on-board SSRAM.
Fr
eescale S
emiconduct
or
, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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