
12-30
ColdFire CF4e Core User’s Manual
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BIST
In Figure 12-22, an 8-Kbyte ICU data array is tested with EBIST mode. The cycles shown
represent a transition from the [W(5)] March C+ part to the [R(5),W(A),R(A)] part. During
address 0, bistdata is [data, data, data, data, data, data, data, data] for the first two part
transitions of the first background; minimum of two processor clock halt for the automatic
hold signal. For the remaining address 0, bistdata[3:0] output is [data, data, data, data, data,
data]. For all other addresses, then it is [data,data,data,DATA,DATA,data], in this case
[5,5,5,A,A,5]. In this example, the system/processor clock ratio is 2:1, but only the
processor clock is displayed.
Figure 12-22. EBIST Timing Diagram For An 8-Kbyte Cache Data Array
In Figure 12-23, a 2-Kbyte KRAM0 array is tested in EBIST mode. The cycles shown
represent a transition from the [W(5)] March C+ part to the [R(5),W(A),R(A)] part. During
address 0, bistdata[3:0] is [olddata, olddata, olddata, olddata, olddata, data, data, data] for
the first two parts of the first background; minimum of two processor clock halt for the
automatic hold signal. Old data is the data from the previous March Part. For the remaining
address 0, bistdata is [olddata, olddata, olddata, data, data, data]. For all other addresses,
the bistdata output is [data,data,data,DATA,DATA,data], in this case [5,5,5,A,A,5].
16K
1, 2, X
3, 0, 1
0, 3, 3
4, A, 0
2, C, 5
0, E, 2
5, A, 0
3, C, 5
0, F, 3
32K
1, 2, X
3, 0, 1
0, 3, 3
4, 8, 0
0, C, 4
0, C, 0
5, A, 0
3, C, 5
0, F, 3
Table 12-5. EBIST Tag Output Data (Continued)
Tag
Size
Test 0
Test 1
Test 2+
Bckgnd 0
Bckgnd 1
Bckgnd 2
Bckgnd 0
Bckgnd 1
Bckgnd 2
Bckgnd 0
Bckgnd 1
Bckgnd 2
processor clk
mtmod[2:0]
bistmemory[2:0]
bistrelease
bistdone
bistfail
*memory datain[31:0]]
*memory address[31:0]
bistdata[3:0]
bisthold
12312 13
14
15
16
17
18
19 12320 21
22
23
24
25
26
27
28
29 12330 31
memory dataout[31:0]
*internal signals
110
011
2047
0
1
5555555
AAAAAAA
5555555
AAAAAAA
5555555
5555555
x...x
A
5
5
AAAAAAA
F
Freescale Semiconductor, Inc.
n
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