User`s manual

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.