pxf4336 Infineon Technologies Corporation, pxf4336 Datasheet - Page 143

• Manufacturer Part Number: pxf4336
• Description: Abm Premium Atm Buf Fer Manager
• Manufacturer: Infineon Technologies Corporation

Table 4-4
calculated at a SYSCLK of 51.84 MHz and 60 MHz with TPmax and
Table 4-4
TstepC
The accuracy of the shaping rate is defined as:
with PCR
always less than PCR
PCR
substituting TP in
The accuracy improves towards lower shaping rates and higher values of TstepC.
Note: The improvement is not monotonic and depends on the rounding error made at
Data Sheet
out
the calculation of TP. However, from the formulas given above, it can be deduced
that the accuracy is always better than:
is calculated by first deriving TP from PCR
0
1
2
3
4
5
6
7
in
shows minimum PCR shaper rates for all the possible values of TstepC
denoting the desired PCR and PCR
acc
acc
1/Tstep
Minimum Shaper Rates as a Function of TstepC and SYSCLK
PCR
PC R
Equation
256
128
≤
64
32
16
=
in
---------------------------------------------------------
2
8
4
2
.
PCR
------------------------------------------ -
×
SYSCLK = 51.84 [MHz]
PCR
[cells/s]
SYSCLK
PCR
in
(15).
PCR
RSmin
–
197.950
395.900
791.800
PCR
out
12.371
24.743
49.487
98.975
6.185
in
×
out
Tstep
PBR
[bit/s]
143
RSmin
out
167861
335723
10491
20982
41965
83930
denoting the delivered PCR, which is
2622
5245
in
SYSCLK = 60 [MHz]
PCR
[cells/s]
in
Operational Description
Equation (16)
RSmin
114.555
229.110
458.219
916.437
14.320
28.639
57.278
7.160
Equation
PXF 4336 V1.1
PBR
[bit/s]
2001-12-17
RSmin
and then
(15).
194285
388569
ABM-P
12143
24286
48572
97143
3036
6072
(19)
(20)