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Hardware
unsigned short x;
unsigned char y;
unsigned int retry;
// Init first 1k of EEPROM with 0xFF
y = 0xff;
for (x = 0; x < 1024; x++)
{
retry = 0;
while (I2C_WR(0, x, &y))
{
retry++;
if (retry > 150)
{ return 1; }
}
}
return 0;
}
3.6
Voltage Regulators
Two linear regulator modules on the SPT711xPFCE generate the DDR SDRAM (2.5 VDC) and Ethernet
switch core (2.5 V) voltages from the externally supplied 3.3 VDC. A switching regulator generates the
MSC711x core (1.2 VDC) voltage from the externally-supplied 5 VDC. Figure 9 shows how to probe the
board voltages.
SRAM
711x
711x
SRAM
C9
C17
5V
TAB – GND
C35
U10
U9
CPLD
1V2
PIN 4 – 2V5
(DDR)
PIN 4 – 2V5 (Switch)
SRAM
711x
PIN 1
711x
SRAM
– 3V3
SIDE 2
N
E
Side 2
Figure 9. Voltage Probing Points
MSC711x Packet Telephony Farm Card (SPT711xPFCE), Rev. 1
Freescale Semiconductor
21
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