Evb Led Descriptions; Optional Memory Configuration - Motorola MPC505EVB User Manual

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.
Bank
BANK1
BANK2
BANK3
BANK4
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.
MPC505EVBUM/D
Table 2-5. Optional Memory Configuration
Upper Word Lower Word
U29 U19
U30 U20
U31 U21
U32 U22
HARDWARE PREPARATION AND INSTALLATION
64Kb Memory
Part Numbers
MCM67M518
MCM67M518
MCM67M518
MCM67M518
128Kb Memory
Part Numbers
MCM67M618
MCM67M618
MCM67M618
MCM67M618
2-9