MPC8260TCOM User’s Manual
PRELIMINARY
FUNCTIONAL DESCRIPTION
16
Receive - to - transmit loopback activated by placing a low on RT pin.
For more information see the TXC-20153G and TXC-02020 user manual.
The physical control to the RT, TR signals of both DS3 modules are controlled as follow:
DS3_1 RT will be low if PA5 and PA1 will be low. (if PA1 is high there is no loop back at all)
DS3_1 TR will be low if PA5 will be high and PA1 will be low. (if PA1 is high there is no loop back at all)
DS3_2 RT will be low if PC13 and PA1 will be low. (if PA1 is high there is no loop back at all)
DS3_2 TR will be low if PC13 will be high and PA1 will be low. (if PA1 is high there is no loop back at all)
3•7
T1
The T1 is a 1.544Mhz serial line; this board can handle up to 8 T1 line simultaneously. All the T1 modules
on this board are composed by one PM4388 (Framer), 2 PM4314 (LIU) and 2 ST5170 transformers. The
PM4388 device includes 8 T1 framers, each framer in this device can be controlled by its own internal
registers. The PM4388 controlled by the MPC8260 data and address bus. It gets its chip select signal from
the control logic. The PM4314, which is a quad line interface unit, is connected from one side to the framer,
PM4388, and from the other side to the line transformer. Each one of the T1 line interface units can be also
controlled by the internal registers. This device is also connected to the MPC8260 by the address and data
bus. It gets it’s chip select signal from the control logic. The ST5170 includes a 4 transformers, each one
of the ST5170 connected to one PM4314 device.
Each one of the MPC8260 T1 group of signals can be isolate from the framer by buffer. (The PM4388
device can not isolate independently one of the eight T1 signal group). T1_1,2,3,4 modules can be isolated
by PD4-PD7. ’0’ on these signals enables each T1 interface. The T1-5,6,7,8 modules can be isolated by
PD8, PD9, PD18 and PD19. ’0’ on these signals enables each T1 interface. 8 leds are placed on the board
to show which one of the T1 port is enable. Each led lights depend upon the enable T1 signal, for example
if PD4 will be low LD24 (T1_1 enable) will light.
Together with the 8260ADS board it will be possible to operate the 8 x T1 and ATM 155Mbps or Fast
Ethernet over FCC1.
3•8
Control Logic.
The control logic allows the user to disable each one of the following elements: 8 x T1, 2 x DS3 and 4 x
DS3 loopback options. Although each one of the T1 is enabled directly from the MPC8260, all the T1
enable signals insert to the logic control, in order to disable a DS3 module that share some signal(s) as
T1_x. If one of the T1 enable and it share the same signals as one of the DS3, the appropriate DS3 will be
disable.
Each one of the Fast-Ethernet modules connected to FCC1,FCC2 and FCC3 (on the 8260TCOM or on the
8260ADS) is controlled via the MDIO and MDC signals (PC10, PC9); the SW should be aware that
enabling the Fast Ethernet without disabling the corresponding element that share the same GPIO signals
will damage the board. FE1 share the signals as the ATM module on the ADS, FE0 (the one that is placed
on the 8260ADS) share some of the T1_8, T1_7, T1_6 and T1_5. FE2 share some of the signals of T1_6,
T1_5, T1_4 T1_3
In order to use DS3 the SW should drive PD25 for DS3_1 (FCC2) to low or PA4 for DS3_2 (FCC3) to low.
If no one of the T1 that share the same signal of the desire DS3 is enable, the DS3(x) will be enable. The
user should disable the appropriate T1 channel if the appropriate T1 channel will not be disable the DS3
will not be enable. DS3(1) share the same signals with T1_1, T1_7 and T1_8, DS3(2) share the same
signals with T1_8, T1_5, T1_4, T1_3.
In addition to the above GPIO control signal from the MPC8260 the 8260TCOM Board use PA1, PA5 and
PC13 to select 4 types of DS3 loop-back as describe in the DS3 description paragraph.
The logic control select each one of the following devices by asserting it’s Chip Select signal, The ADS
drive two CS signals to the TCOM CS6 and CS7 called CSBRD1 and CSBRD2.
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
.
..
