mcf5307cft90b Freescale Semiconductor, Inc, mcf5307cft90b Datasheet - Page 400
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mcf5307cft90b
Manufacturer Part Number
mcf5307cft90b
Description
Mcf5307 Coldfire Integrated Microprocessor User
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MCF5307CFT90B.pdf
(484 pages)
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Data Transfer Operation
18.4.7.1 Line Transfers
A line is a 16-byte-aligned, 16-byte value. Despite the alignment, a line access may not
begin on the aligned address; therefore, the bus interface supports line transfers on multiple
address boundaries. Table 18-5 shows allowable patterns for line accesses.
18.4.7.2 Line Read Bus Cycles
Figure 18-12 shows line read with zero wait states. The access starts like a basic read bus
cycle with the first data transfer sampled on the rising edge of S4, but the next pipelined
burst data is sampled a cycle later on the rising edge of S6. Each subsequent pipelined data
burst is single cycle until the last one, which can be held for up to 2 BCLKO cycles after
TA is asserted. Note that AS and CSx are asserted throughout the burst transfer. This
example shows the timing for external termination, which differs only from the internal
termination example in Figure 18-13 in that the address lines change only at the beginning
(assertion of TS and TIP) and end (negation of TIP) of the transfer.
Figure 18-13 shows timing when internal termination is used.
18-12
TM[2:0], SIZ[1:0]
A[31:0], TT[1:0]
BE/BWEx, OE
AS, CSx
BCLKO
D[31:0]
R/W
TIP
TS
TA
Figure 18-12. Line Read Burst (2-1-1-1), External Termination
Table 18-5. Allowable Line Access Patterns
Freescale Semiconductor, Inc.
S0
For More Information On This Product,
A[3:2]
S1
00
01
10
11
Go to: www.freescale.com
S2
MCF5307 User’s Manual
S3
Read
S4
Read
S5
Longword Accesses
S6
0–4–8–C
4–8–C–0
8–C–0–4
C–0–4–8
Read
S7
S8
S9
Read
S10
S11 S12
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