MPC8313ECZQADDC Freescale Semiconductor, MPC8313ECZQADDC Datasheet - Page 892
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MPC8313ECZQADDC
Manufacturer Part Number
MPC8313ECZQADDC
Description
Microprocessors - MPU 8313 REV2.2 PB ENC EXT
Manufacturer
Freescale Semiconductor
Datasheet
1.MPC8313CZQADDC.pdf
(1214 pages)
Specifications of MPC8313ECZQADDC
Processor Series
MPC8313E
Core
e300
Data Bus Width
16 bit
Maximum Clock Frequency
133 MHz
Program Memory Size
16 KB
Data Ram Size
16 KB
Interface Type
I2C
Mounting Style
SMD/SMT
Package / Case
PBGA
Number Of Programmable I/os
32
Number Of Timers
4
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Enhanced Three-Speed Ethernet Controllers
15.6.4.3.1
PBQ is the simplest scheduler decision policy. The enabled TxBD rings are assigned a priority value based
on their index. Rings with a lower index have precedence over rings with higher indices. For example,
TxBD ring 0 has higher priority than TxBD ring 1, and TxBD ring 1 has higher priority than TxBD ring
2, and so on.
The scheduling decision is then achieved as follows:
In practice a protocol stack or device driver can abuse PBQ by attempting to queue too much traffic onto
high priority rings. It is recommended that the highest priority ring should normally not be used at all
except for frames requiring the utmost urgent transmission. This allows emergency traffic to overtake
backlogged queues out of sequence.
15.6.4.3.2
eTSEC implements a modified weighted round-robin scheduling algorithm across all enabled TxBD rings
when TCTRL[TXSCHED] = 10. In MWRR, the weights in the TR03WT and TR47WT registers
determine the ideal size of each transmit slot, as measured in multiples of 64 bytes. Thus, to set a transmit
slot of 512 bytes, a weight of 512/64 or 8 needs to be set for the ring. In this mode TxBD rings 1–7 are
selected in round-robin fashion, whereas TxBD ring 0, if enabled with ready data for transmission, is
always selected in between other rings so as to expedite transmission from ring 0.
The scheduling decision is then achieved as follows:
15-174
loop
endloop
for ring = 1..7 and enabled(ring) loop
endloop
for ring = 1..7 and enabled(ring) loop
priority_ring = null;
ring = 0;
while priority_ring == null and ring <= 7 loop
endloop
if priority_ring >= 0 then
endif
credit[ring] = 0;
if not ring_empty(0) then
endif
if enabled(ring) and not ring_empty(ring) then
endif
ring = ring + 1;
while not ring_empty(priority_ring) loop
endloop
credit[0] = credit[0] + weight[0];
while credit[0] > 0 loop
endloop
MPC8313E PowerQUICC™ II Pro Integrated Processor Family Reference Manual, Rev. 2
Priority-Based Queuing (PBQ)
Modified Weighted Round-Robin Queuing (MWRR)
priority_ring = ring;
transmit_frame(priority_ring);
transmit_frame(0);
credit[0] = credit[0] - frame_size;
if ring_empty(0) then
endif
credit[0] = 0;
Freescale Semiconductor
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