tmpr4937 TOSHIBA Semiconductor CORPORATION, tmpr4937 Datasheet - Page 108
tmpr4937
Manufacturer Part Number
tmpr4937
Description
64-bit Tx System Risc
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMPR4937.pdf
(552 pages)
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Upper Address
Lower Address
7.3.5.3
ADDR Bit
8-bit Bus Width Mode
which are the upper address, are multiplexed to external ADDR[19:12]. In other words, the
address is shifted up two bits or more relative to the 32-bit bus mode when output. As a result, the
maximum memory size of the 8-bit bus mode is 256 MB.
the external bus. 8-bit access is executed twice when performing 1-half-word access. 8-bit access
is executed four times when performing 1-word access. 8-bit access is executed eight times when
performing 1-double-word access. When a Burst cycle is executed, eight 8-bit cycles are executed
for each Burst access when the Bus cycle tries to request a byte combination other than double-
word data.
Table 7.3.6 Address Output Bit Correspondence in the 8-bit Mode
DATA[7:0] becomes valid.
Bits [19:0] of the physical address are output to ADDR[19:0]. The internal address bits [27:20],
When a Single cycle that accesses 1-Byte data is executed, 8-bit access is executed only once on
19 18 17 16 15 14 13 12 11 10 9
27 26 25 24 23 22 21 20
19 18 17 16 15 14 13 12 11 10
7-8
Chapter 7 External Bus Controller
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