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DSP56857 Datasheet(PDF) 353 Page - Freescale Semiconductor, Inc

Part # DSP56857
Description  Digitial Signal Controller
PDF  662 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

DSP56857 Datasheet(HTML) 353 Page - Freescale Semiconductor, Inc

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Register Descriptions (ESSI0_BASE = $1FFE20, ESSI1_BASE = $1FFE00)
Enhanced Synchronous Serial Interface (ESSI), Rev. 4
Freescale Semiconductor
12-53
12.8.12 Time Slot Register (STSR)
This register is used when data is not to be transmitted in an available transmit time slot,
determined by the TSM registers. For the purposes of timing, the Time Slot register is a
write-only register behaving like an alternate transmit data register, except instead of transmitting
data, the STD pin signal is tri-stated. Using this register is important in avoiding
overflow/underflow during inactive time slots.
Figure 12-27. ESSI Time Slot Register (STSR)
See Programmer’s Sheet on Appendix page B - 79
Table 12-18. Chip Clock Rates as a Function of ESSI
Bit Clock Frequency and Prescale Modulus
Frame
Rate
Words/Frame
(DC+1)
Bits/
Word
Bit Clock
Rate (Hz)
PM PSR FIX_CLK Rate DIV4DIS
IP_CLK Rate1
1.
Shaded cells denote configuration where the required clock rate is higher than the chip specification can
support.
SYS_CLK
Rate2
2.
IP_CLK is 1/2 the SYS_CLK rate.
8000
32
8
2,048,000
6
0
57,344,000
1
57,344,000
114,688,000
8000
32
8
2,048,000
7
0
65,536,000
1
65,536,000
131,072,000
8000
24
8
1,536,000
8
0
55,296,000
1
55,296,000
110,592,000
8000
24
8
1,536,000
9
0
61,440,000
1
61,440,000
125,880,000
8000
2
10
160,000
10
1
56,320,000
1
56,320,000
112,640,000
8000
2
10
160,000
11
1
61,440,000
1
61,440,000
122,880,000
8000
2
10
160,000
22
0
14,720,000
0
58,880,000
117,760,000
8000
2
10
160,000
92
0
59,520,000
1
59,520,000
119,040,000
8000
2
10
160,000
93
0
60,160,000
1
60,160,000
120,320,000
8000
2
12
192,000
8
1
55,296,000
1
55,296,000
110,592,000
8000
2
12
192,000
9
1
61,440,000
1
61,440,000
122,880,000
8000
2
12
192,000
18
0
14,593,000
0
58,368,000
116,736,000
8000
2
12
192,000
77
0
59,904,000
1
59,904,000
119,808,000
8000
2
12
192,000
78
0
60,672,000
1
60,672,000
120,344,000
8000
2
16
256,000
6
1
57,344,000
1
57,344,000
114,688,000
8000
2
16
256,000
7
1
65,536,000
1
65,536,000
131,072,000
8000
2
16
256,000
13
0
14,336,000
0
57,344,000
116,736,000
8000
2
16
256,000
57
0
59,904,000
1
59,904,000
118,784,000
8000
2
16
256,000
58
0
60,416,000
1
60,416,000
120,832,000
Base + $A
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Read
Write
DUMMY REGISTER WRITTEN DURING INACTIVE TIME SLOTS (NETWORK MODE)
Reset
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x



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