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support up to 24-bit addresses or 16-bit data. When a read operation is requested by the AHB interface,
the address is transferred onto the EBI_AD bus. After a specific number of cycles, the EBI_REn pin is
activated and data is read from the EBI_AD bus. When a write operation is requested, the address is
transferred onto the EBI_AD bus and subsequently the write data is transferred onto the EBI_AD bus
as the EBI_WEn pin is activated. The detailed operation in the supported modes is presented in the
following sections.
Figure 14.1. EBI Overview
EBI_AD[ 15:0]
Data/Address
EBI_WEn
EBI_REn
CONTROL
EBI_CSn[ 3:0]
EBI_ARDY
Tim ing
Polarity
EBI_ALE
MODE
14.3.1 8-bit Address Mode
In this mode, 8-bit address and 8-bit data is supported. The address is put on the higher 8 bits of the
EBI_AD lines while the data uses the lower 8 bits. This mode is set by programming the MODE field
in the EBI_CTRL register to D8A8. Read and write signals in 8-bit mode are shown in Figure 14.2 (p.
135) and Figure 14.3 (p. 136) respectively.
Figure 14.2. EBI Non-multiplexed 8-bit Data, 8-bit Address Read Operation
RDSETUP
(0, 1, 2, ...)
RDSTRB
(1, 2, 3, ...)
RDHOLD
(0, 1, 2, ...)
EBI_AD[ 15:8]
ADDR[ 7:0]
Z
EBI_AD[ 7:0]
Z
DATA[ 7:0]
Z
EBI_CSn
EBI_REn
2011-04-12 - d0001_Rev1.10
135
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