Texas Instruments TMS570LC4357 - Page 1865

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SPNU563A–March 2018
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EMAC/MDIO Module
32.3.12 EMAC Control Module Receive Interrupts Per Millisecond Registers (C0RXIMAX)
The EMAC control module receive interrupts per millisecond register (C0RXIMAX) is shown in Figure 32-
26 and described in Table 32-22
Figure 32-26. EMAC Control Module Receive Interrupts Per Millisecond Register (C0RXIMAX)
(offset = 70h)
31 16
Reserved
R-0
15 6 5 0
Reserved RXIMAX
R-0 R/W-0
LEGEND: R = Read only; R/W = Read/Write; -n = value after reset
Table 32-22. EMAC Control Module Receive Interrupts Per Millisecond Register (C0RXIMAX)
Bit Field Value Description
31-6 Reserved 0 Reserved
5-0 RXIMAX 2-3Fh RXIMAX is the desired number of C0RXPULSE interrupts generated per millisecond when
C0RXPACEEN is enabled in INTCONTROL.
The pacing mechanism can be described by the following pseudo-code:
while(1) {
interrupt_count = 0;
/* Count interrupts over a 1ms window */
for(i = 0; i < INTCONTROL[INTPRESCALE]*250; i++) {
interrupt_count += NEW_INTERRUPT_EVENTS();
if(i < INTCONTROL[INTPRESCALE]*pace_counter)
BLOCK_EMAC_INTERRUPTS();
else
ALLOW_EMAC_INTERRUPTS();
}
ALLOW_EMAC_INTERRUPTS();
if(interrupt_count > 2*RXIMAX)
pace_counter = 255;
else if(interrupt_count > 1.5*RXIMAX)
pace_counter = previous_pace_counter*2 + 1;
else if(interrupt_count > 1.0*RXIMAX)
pace_counter = previous_pace_counter + 1;
else if(interrupt_count > 0.5*RXIMAX)
pace_counter = previous_pace_counter - 1;
else if(interrupt_count != 0)
pace_counter = previous_pace_counter/2;
else
pace_counter = 0;
previous_pace_counter = pace_counter;
}