Freescale Semiconductor MPC5200B - Manual (Page 274)

Configuration
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor 9-9
Figure 9-6 shows a MUXed transaction type timing diagram.
Figure 9-6. Timing Diagram—MUXed Mode
9.5 Configuration
The LPC supports several options in terms of modes, address and data sizes, speed, and configuration which are described below.
9.5.1 Boot Configuration
After power-on reset (POR) the e300 processor accesses the local bus to fetch initial code sequences. Chip Select Boot (CS Boot) is dedicated
for this purpose. CS Boot and CS0 are physically the same pins. The difference is that CS Boot is impacted by the reset configuration and is
enabled after reset.
Several options are also available for boot code fetches. The boot configuration is determined during POR using the reset_configuration word.
The following boot code configuration options are available, see Table 9-6.
• MUXed or non-MUXed mode.
— In MUXed mode Data bus can be 16- or 32-bits wide.
— In non-MUXed Legacy mode Data bus can be 8- or 16-bits wide.
— In non-MUXed MOST Graphics mode Data bus can be 32-bits wide.
— In non-MUXed Large Flash modes Data bus can be 8- or 16-bits wide.
• The number of wait states during boot can be 4 or 48 PCI bus clock cycles.
PCI CLK
AD[24:0] (wr)
CSx
RW
ALE
AD[30:28] (wr)
AD[26:25] (wr)
AD[31,27] (wr)
Address[7:31]
Bank[0:1] bits
TSIZ[0:2] bits
ACK
valid write Data
Data tenure Address tenure
TS
valid write Data
valid write Data
valid write Data
AD[31:0] (rd)
valid read Data
OE
NOTE:
1. ACK can shorten the CS pulse width.
2. Address should be latched with the rising edge of ALE.