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參數(shù)資料
| 型號： | MC145572APB |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 36/52頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ISDN INTERFACE TXCVER 44-LQFP |
| 標(biāo)準(zhǔn)包裝： | 160 |
| 類型： | 收發(fā)器 |
| 規(guī)程： | RS232 |
| 電源電壓： | 5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-LQFP |
| 供應(yīng)商設(shè)備封裝： | 44-LQFP（10x10） |
| 包裝： | 托盤 |
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MC145572EVK
42
OR0:00 OR1:04 OR2:8
OR3:00
OR4:04
OR5:08 OR6:E0 OR7:00
OR8:00 OR9:00
MC145574 S-T Chip Register Contents
NR0:0
NR1:B
NR2:1
NR3:8
NR4:0
NR5:0
NR6:8
BR0:00 BR1:00 BR2:00
BR3:F0
BR4:00
BR5:00 BR6:00 BR7:00
BR8:C0 BR9:00 BR10:00 BR11:00 BR12:00 BR13:00 BR14:00 BR15:4C
NTLT>
3.2.9
eoc — Embedded Operations Channel Menu
3.2.9.1
FORMAT.
eoc<ENTER>
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 conguration.
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
dened 3-bit address and the message/data bit. The ANSI T1.601-1992 dened embedded operations
channel address is stored in bits 3, 2, and 1 of the address nibble. This corresponds to the ANSI
T1.601-1992 dened bits, eoc(a1), eoc(a2), and eoc(a3), respectively. Bit 0 of the address nibble
corresponds to ANSI T1.601-1992 dened 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 predened 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.
NOTE
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.
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 congured as NT/LT.
The most signicant 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 signicant bits (000) indicate NT1 address, and
the least signicant bit, which is a 1, indicates that an eoc message is being sent. The ANSI standard
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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