MC145572APB Freescale Semiconductor, MC145572APB Datasheet - Page 41

• Manufacturer Part Number: MC145572APB
• Description: IC ISDN INTERFACE TXCVER 44-LQFP
• Manufacturer: Freescale Semiconductor
• Type: Transceiverr

Specifications of MC145572APB

• Protocol: RS232
• Voltage - Supply: 5V
• Mounting Type: Surface Mount
• Package / Case: 44-LQFP
• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Number Of Drivers/receivers: -
• Lead Free Status / Rohs Status: Not Compliant

OR0:00 OR1:04 OR2:8
OR8:00 OR9:00
MC145574 S-T Chip Register Contents
NR0:0
BR0:00 BR1:00 BR2:00
BR8:C0 BR9:00 BR10:00 BR11:00 BR12:00 BR13:00 BR14:00 BR15:4C
NTLT>
3.2.9
3.2.9.1 FORMAT.
This command brings up the status of the embedded operations channels on the LT and NT1 side
U-Interface Transceivers. If the board is being operated from the NT1 half, a menu is displayed which
permits the user to select an eoc message to be sent from the NT1 to the LT when a loop is activated.
The appropriate LT or NT U-Interface Transceiver eoc status displays are brought up depending on the
board conÞguration.
3.2.9.2 eoc MENU DESCRIPTION. The eoc menu divides an eoc command into two parts: the
address nibble and the message byte, for a total of 12 bits. The address nibble holds the ANSI T1.601-1992
deÞned 3-bit address and the message/data bit. The ANSI T1.601-1992 deÞned embedded operations
channel address is stored in bits 3, 2, and 1 of the address nibble. This corresponds to the ANSI
T1.601-1992 deÞned bits, eoc(a1), eoc(a2), and eoc(a3), respectively. Bit 0 of the address nibble
corresponds to ANSI T1.601-1992 deÞned bit eoc(dm). Menu items I and J permit manipulation of the
ANSI T1.601-1992 eoc address and message/data bit which are stored as the default address nibble.
Menu items A through H permit the user to select a predeÞned message byte or permit the user to create
a custom message byte. The MC145572EVK software creates an eoc command by concatenating the
default address nibble and the message byte to create a 12-bit eoc command. The 12-bit eoc command
is loaded into R6 and sent on the next eoc frame boundary. The MC145572EVK software treats the address
nibble and the message byte as independent entities.
The menu permits the user to send standard eoc message codes, set a new default eoc address nibble,
or send a custom 8-bit eoc message appended to the current default eoc address nibble. After each menu
option has been executed, the menu is displayed again. The menu can be exited by pressing the <ENTER>
key. In normal operation, menu items A through G are used. Menu items H, I, and J are used if a different
default address is desired, or when eoc commands are being transmitted to an NT1 that uses non-ANSI
standard eoc commands. The eoc menu appears when the MC145572EVK is conÞgured as NT/LT.
The most signiÞcant nibble is the eoc address nibble. These four bits are set to a default value of 0001
binary when the MC145572EVK is reset. The three most signiÞcant bits (000) indicate NT1 address, and
the least signiÞcant bit, which is a 1, indicates that an eoc message is being sent. The ANSI standard
MC145572EVK
42
The RES command does not affect the setting of the current eoc default address nibble.
At power up, it is binary 0001. It can only be changed by selecting eoc menu options I or J.
NR1:B
eoc — Embedded Operations Channel Menu
eoc<ENTER>
NR2:1
OR3:00
NR3:8
Freescale Semiconductor, Inc.
BR3:F0
For More Information On This Product,
NR4:0
OR4:04
Go to: www.freescale.com
BR4:00
NR5:0
NOTE
OR5:08 OR6:E0 OR7:00
BR5:00 BR6:00 BR7:00
NR6:8