UTOPIA16EVK/NOPB National Semiconductor, UTOPIA16EVK/NOPB Datasheet - Page 64

• Manufacturer Part Number: UTOPIA16EVK/NOPB
• Manufacturer: National Semiconductor

Specifications of UTOPIA16EVK/NOPB

• Lead Free Status / Rohs Status: Compliant

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MTBQT30
0xA9
MTBQT29
0xAA
MTBQT2 0xC5
18.0 Register Description
18.61 UTOPIA CONNECTED SUB-PORT LIST — 0xA6 UCSPL
Type:
Software Lock: Yes
Reset Value:
The UCSPL register defines the connected UTOPIA sub-ports within all ports for polling.
18.62 UTOPIA SUB-PORT ADDRESS LOCATION — 0xA7 USPAL
Type:
Software Lock: Yes
Reset Value:
The UTOPIA Sub-Port Address Location register defines which byte of the PDU header the sub-port address is contained in when
using Extended UTOPIA mode. The PDU header consists of the User Prepend, the ATM cell header and UDF bytes, and so can
be a maximum of 18 bytes. The first of these bytes is denoted as byte 0. The corresponding USPAM register is used to define
which bits in the byte contain the sub-port address.
18.63 UTOPIA SUB-PORT ADDRESS MASK — 0xA8 USPAM
Type:
Software Lock: Yes
Reset Value:
The UTOPIA Sub-Port Address Mask register defines which bits of the PDU header byte defined by the USPAL register contain
the sub-port address.
Note that only 3 bit locations must be set in this register to give the 3 bit sub-port address location. All other bits must be clear.
By default, bits USPAM[2:0] are set, indicating that the sub-port address is located in bits [2:0] of the PDU header byte indicated
by the USPAL register, with the MSB in bit [2] and the LSB in bit [0]. If USPAM bits [6], [4] and [1] were set, then the sub-port
address would be located in bits [6], [4] and [1] of the PDU header byte indicated by the USPAL register, with the MSB in bit [6]
and the LSB in bit [1].
18.64 MTB QUEUE THRESHOLD — 0xA9 to 0xC7 MTBQT30 to MTBQT0
• UCPL3–UCPL0 UCPL3[6] corresponds to port 31 and UCPL0[0] corresponds to port 0. When a bit is set then the port is
• UCSPL UCSPL[7] corresponds to sub-port 7 (CLAV7) and UCSPL[0] corresponds to sub-port 0 (CLAV0). When a bit is set,
• USPAL[4:0] Byte number of the PDU header byte which contains the UTOPIA sub-port address.
• USPAM[7:0] Set = This bit location contains valid sub-port address bit.Clear = Ignore this bit location.
connected and will be polled, when clear the port is not connected and will not be polled.
then the sub-port is connected and will be polled; when clear, the sub-port is not connected and will not be polled.
USPAM[7]
UCSPL[7]
Reserved
MTBQT30[7]
MTBQT29[7]
MTBQT2[7]
7
7
7
Read/Write
0x01
Read/Write
0x00
Read/Write
0x07
7
USPAM[6]
UCSPL[6]
Reserved
MTBQT30[6]
MTBQT29[6]
MTBQT2[6]
6
6
6
6
USPAM[5]
UCSPL[5]
Reserved
5
5
5
MTBQT30[5]
MTBQT29[5]
MTBQT2[5]
(Continued)
TABLE 84. MTBQT30–MTBQT0
5
USPAM[4]
UCSPL[4]
USPL[4]
TABLE 83. USPAM
TABLE 81. UCSPL
TABLE 82. USPAL
4
4
4
MTBQT30[4]
MTBQT29[4]
MTBQT2[4]
64
4
USPAM[3]
UCSPL[3]
USPL[3]
3
3
3
MTBQT30[3]
MTBQT29[3]
MTBQT2[3]
3
USPAM[2]
UCSPL[2]
USPL[2]
2
2
2
MTBQT30[2]
MTBQT29[2]
MTBQT2[2]
2
USPAM[1]
UCSPL[1]
USPL[1]
1
1
1
MTBQT30[1]
MTBQT29[1]
MTBQT2[1]
USPAM[0]
UCSPL[0]
USPL[0]
1
0
0
0
MTBQT30[0]
MTBQT29[0]
MTBQT2[0]
0