Atmel SpaceWire Router SpW-10X User Manual
Ref.: UoD_SpW-10X_
UserManual
Issue: 3.4
SpW-10X
SpaceWire Router
User Manual
Date: 11
th
July 2008
Preliminary
83
(
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2
*
1
10
2
*
20
100
10
1
⎟
⎟
⎟
⎟
⎠
⎞
⎜
⎜
⎜
⎜
⎝
⎛
+
⎟
⎠
⎞
⎜
⎝
⎛
+
=
+
MbitDIV
TX
FEEDBDIV
MHz
MHz
MbitRate
TXDIV
To provide a SpaceWire signal with a nominal 50/50 duty cycle, TXRATE and TX10MbitDIV should be
even integers.
even integers.
Not all values of FEEDBDIV, TXDIV and TXRATE give valid clock signals. Table 8-1shows the
recommended values to use to achieve a range of SpaceWire transmit data rates.
recommended values to use to achieve a range of SpaceWire transmit data rates.
Table 8-1 Setting SpaceWire Transmit Data Rate
TXRATE
Initialisation
Data Rate
0
1
2
3
4
5
6
7
8
9
10
FEEDB
D
IV
TXDIV
TX1
0
M
B
ITDIV
[1:1]
[1:3] [1:1] [3:5] [1:1] [5:7] [1:1] [7:9] [1:1] [9:11] [1:1]
Data
Rate
Rate
Duty
Cycle
5
0
19
200.0 100.0 66.67 50.0 40.0 33.33 28.57 25.0 22.22 20.0 18.18 10.000 [19:21]
4
0
17
180.0
90.0 60.0 45.0 36.0 30.0 25.71 22.5
20.0
18.0 16.36 10.000 [17:19]
3
0
15
160.0
80.0 53.33 40.0 32.0 26.67 22.86 20.0 17.78 16.0 14.55 10.000 [15:17]
2
0
13
140.0
70.0 46.67 35.0 28.0 23.33 20.0
17.5 15.56 14.0 12.73 10.000 [13:15]
1
0
11
120.0
60.0 40.0 30.0 24.0 20.0 17.14 15.0 13.33 12.0 10.91 10.000 [11:13]
0
0
9
100.0
50.0 33.33 25.0 20.0 16.67 14.29 12.5 11.11 10.0 9.09 10.000 [9:11]
5
1
9
100.0
50.0 33.33 25.0 20.0 16.67 14.29 12.5 11.11 10.0 9.09 10.000 [9:11]
4
1
8
90.0
45.0 30.0 22.5 18.0 15.0 12.86 11.25 10.0
9.0
8.18 10.000 [1:1]
3
1
7
80.0
40.0 26.67 20.0 16.0 13.33 11.43 10.0
8.89
8.0
7.27 10.000 [7:9]
2
1
6
70.0
35.0 23.33 17.5 14.0 11.67 10.0
8.75
7.78
7.0
6.36 10.000 [1:1]
1
1
5
60.0
30.0 20.0 15.0 12.0 10.0
8.57
7.5
6.67
6.0
5.45 10.000 [5:7]
0
1
4
50.0
25.0 16.67 12.5 10.0 8.33
7.14
6.25
5.56
5.0
4.55 10.000 [1:1]
5
2
4
50.0
25.0 16.67 12.5 10.0 8.33
7.14
6.25
5.56
5.0
4.55 10.000 [1:1]
4
2
4
45.0
22.5 15.0 11.25 9.0
7.5
6.43
5.63
5.0
4.5
4.09 9.000
[1:1]
3
2
3
40.0
20.0 13.33 10.0
8.0 6.67
5.71
5.0
4.44
4.0
3.64 10.000 [3:5]
2
2
2
35.0
17.5 11.67 8.75
7.0 5.83
5.0
4.38
3.89
3.5
3.18 11.667 [1:1]
1
2
2
30.0
15.0 10.0
7.5
6.0
5.0
4.29
3.75
3.33
3.0
2.73 10.000 [1:1]
0
2
2
25.0
12.5 8.33 6.25
5.0 4.17
3.57
3.13
2.78
2.5
2.27 8.333
[1:1]
In Table 8-1 the values with a white background are the values that should be used. The ones in
red/shaded should not be used.
red/shaded should not be used.
The first three columns give settings for the FEEDBDIV pins on the SpW-10X device, the TXDIV field
in the transmit clock register (see section 9.5.9) and the TX10MbitDIV field also in the transmit clock
register.
in the transmit clock register (see section 9.5.9) and the TX10MbitDIV field also in the transmit clock
register.