TC1796
System Units (Vol. 1 of 2)
LMB External Bus Unit
User’s Manual 13-66 V2.0, 2007-07
EBU, V2.0
13.9.2 Burst Flash Memory Configurations
The EBU supports two different configurations of Burst Flash memory devices: 16-bit
mode and 32-bit mode. Both modes are demultiplexed modes with separate address
and data lines.
The 16-bit Burst Flash mode is selected by:
• EBU_BUSCONx.PORTW = 01
B
• EBU_BUSCONx.AGEN = 010
B
(Burst Flash Type 0) or 101
B
(Burst Flash Type 1)
For 16-bit Burst Flash devices, the complete 24-bit address is driven on the EBU pins
during the address phase(s). The 16-bit data is read from the D[15:0] pins during the
burst phases. D[31:16] are not used/connected.
Figure 13-24 Connection of a 16-bit Burst Flash Memory
The 32-bit Burst Flash mode is selected by:
• EBU_BUSCONx.PORTW = 10
B
• EBU_BUSCONx.AGEN = 010
B
(Burst Flash Type 0) or 101
B
(Burst Flash Type 1)
For 32-bit Burst Flash devices, the complete 24-bit address is driven at the EBU pins
during the address phase(s). The 32-bit data is driven to/read from the D[31:0] pins
during the burst phases.
Figure 13-25 Connection of a 32-bit Burst Flash Memory
16-Bit
Burst
FLASH
Memory
A[23:0]
D[15:0]
Not
Connected
D[15:0]
D[31:16]
A[23:0]
MCA05735
TC1796
EBU
16-Bit
Burst
FLASH
Memory
A[23:0]
D[15:0]
D[15:0]
A[23:0]
MCA05736
D[31:16] D[31:16]
TC1796
EBU
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