AK61584 Datasheet, PDF (35/38 Pages) Asahi Kasei Microsystems – Dual Low Power T1/E1 Line Interface

ASAHI KASEI
[AK61584]
CON01, CON11, CON21,
CON02. CON12, CON22 -Configuration Selection, Pins 58, 53, 51, 54, 52, 50.
(Hardware Mode)
Configures the transmitter (pulse shape, pulse width, pulse amplitude and driver impedance),
receiver (slicing level), and coder (HDB3 vs B8ZS)as shown in Table 1. The CONx1 pins
control channel 1. The CONx2 pins control channel 2. Both channels must operate at the
same rate (both T1 or both E1).
CS -Chip Select, Pin 64. (Host modes)
Pin most transition from high to low to read or write the serial port.
INT -Receive Alarm Interrupt, Pin 63. (Host mode)
An interrupt is generated when a status register changes state to flag the host processor.
INT is cleared by reading the status registers. The logic level for an active interrupt
alarm is controlled by pin IPOL. INT is an open drain output and should be tied to the
appropriate supply through a resistor.
IPOL -Interrupt Polarity, Pin 33. (Host mode)
IPOL controls INT polarity. Setting IPOL to logic 1 causes interrupts to be indicated by
INT equal high. Setting IPOL to logic 0 causes interrupts to be indicated by INT equal to
low.
LLOOP1, LLOOP2 -Local Loopback, Pin 62,61. (Hardware Mode)
Setting LLOOP to a logic 1 activates Local Loopback #1. TCLK and TPOS/TNEG (TDATA)
are still transmitted unless overridden by a TAOS request. Inputs on RTIP and RRING are ignored.
MODE -Mode Select, Pin 21.
Setting MODE to logic 1 puts the line interface in the host mode. In the host mode, a serial
interface is used to control the line interface and monitor its status.
Setting MODE to logic 0 puts the line interface in the hardware mode, where it is
configured and monitored using discrete pins. MODE defined the function of pins shown
across the top of the block diagram on the front page of the data sheet. Setting MODE to
AV+/2 volts will cause unpredictable results.
PD1, PD2 - Power Down, Pins 15, 34.
Setting PD1 or PD2 to logic 1 puts the channel 1 or channel 2 line interface, respectively,
in a low power, inactive state. Setting PD1 or PD2 to logic 0 returns the selected channel
to normal operation.
RESET -Reset, Pin 25.
Setting RESET to logic 1 resets the AK61584, clears the host-mode control registers, and
then sets LOS high.
RLOOP1,RLOOP2-Remote Loopback, Pins 63,33. (Hardware Mode)
Setting RLOOP to a logic 1 causes the recovered clock and data on both channels to be sent
through the driver back to the line. The recovered signal is also sent to RCLK and RPOS/RNEG.(RDATA)
0185-E-00
-35-
‘98/04