
MT9071
Preliminary Information
90
19.0 T1 & E1 Transceiver Address Space
The most significant nibble of the address space is used to either access registers common to all four
transceivers (referred to as global registers), or to access individual transceiver registers (referred to as unique
registers). See Table 38 - T1 & E1 Tranceiver Registers Address Space Summary.
Access to transceiver global registers is when the most significant nibble of the address is “9”.
Access to transceiver unique registers is when the most significant nibble (Y) of the address is either “0”, “1”,
“2”, or “3” to access transceiver “0”, “1”, “2” or “3” respectively. Also, when “Y” is “8”, all four transceivers unique
registers are simultaneously accessed with a common write.
The unique register group for T1 mode is different from the unique register group for E1 mode with the
exception of the HDLCs and some LIU registers.
For T1 & E1 HDLC’s, see Table 40 - T1 & E1 Unique HDLC Register Group Address Space.
For T1 & E1 LIU’s, see Table 41 - T1 & E1 Unique LIU Register Group Address Space.
For T1 mode, see Table 42 - T1 Unique Framer Register Group Address Space.
For E1 mode, see Table 43 - E1 Unique Framer Register Group Address Space.
19.1T1 & E1 Transceiver Register Group Address Space Summaries 900-914 & Y00-YFA
Hex Address
(A
11
-A
0
)
000-0FF
100-1FF
200-2FF
300-3FF
800-8FF
900-91F
Tranceiver
Accessed
Registers Accessed
Tranceiver 0
Tranceiver 1
Tranceiver 2
Tranceiver 3
All Tranceivers (0-3)
All Tranceivers (0-3)
All T1 & E1 Unique Transceiver Control, Status and Data Registers
All T1&E1 Unique Transceiver Control and Data Registers-Write Mode Only
All T1 & E1 Global Transceiver Control and Status Registers
Note: address space 400-7FF and 920-FFF is not used
Table 38 - T1 & E1 Tranceiver Registers Address Space Summary
Hex Address (A
11
-A
0
)
Register
Table 44
Address 900, 902, 905, 906
T1 & E1 Global Transceiver Control Registers
Table 45
Address 910-914
T1 & E1 Global Transceiver Status Registers
Table 39 - T1 & E1 Global Transceiver Control & Status Register Group Address Space
Hex Address (A
11
-A
0
)
Register
Table 46
Address Y1C-Y1F
T1 & E1 HDLC Status Registers
Table 47
Address Y23, Y33 & Y43
T1 & E1 HDLC Latched and Interrupt and Mask Registers
Table 48
Address YF2-YF6
T1 & E1 HDLC Control Registers
Table 40 - T1 & E1 Unique HDLC Register Group Address Space