Motorola PowerQUICC II MPC8280 Series Reference Manual page 1106

ATM Registers
0 3
Field TEHS
Reset
R/W
Addr
16 17 18 19
Field — TPRI TUDC RUDC RXP TUMP
Reset
R/W
Addr
Figure 31-59. FCC ATM Mode Register (FPSMR)
Table 31-47 describes FPSMR fields.
Table 31-47. FCC ATM Mode Register (FPSMR)
Bits Name
0–3 TEHS Transmit extra header size. Used only in user-defined cell mode to hold the Tx user-defined
cells' extra header size. Values between 0–11 are valid. TEHS = 0 generates 1 byte of extra
header; TEHS = 11 generates 12 bytes of extra header.
Note: When working with a 16-bit UTOPIA interface, TEHS must represent an even number of
header bytes (so the actual programmed value should be odd).
Note: For IMA
programmed to zero for IMA support.
4–7 REHS Receive extra header size. Used only in user-defined cell mode to hold the Rx user-defined
cells' extra header size. Values between 0–11 are valid. For REHS = 0, the receiver expects 1
byte of extra header; for REHS = 11, it expects 12 bytes of extra header.
Note: When working with a 16-bit UTOPIA interface, REHS must represent an even number of
header bytes (so the actual programmed value should be odd).
Note: For IMA
programmed to zero for IMA support.
8 ICD Idle cells discard
0 Discard idle cells (GFC, VPI, VCI, PTI =0)
1 Do not discard idle cells
Note: For IMA
Idle cells should not occur on an IMA link, and their presence indicates an IMA protocol violation.
Software should disable the discarding of idle cells, route the idle cells to a dedicated channel,
and treat reception of cells on that dedicated channel as an indication of a system or system
configuration error
9 TUMS Transmit UTOPIA master/slave mode
0 Transmit UTOPIA master mode is selected (Use this mode for IMA support
1 Transmit UTOPIA slave mode is selected
10 RUMS Receive UTOPIA master/slave mode
0 Receive UTOPIA master mode is selected (Use this mode for IMA support
1 Receive UTOPIA slave mode is selected
31-92
Freescale Semiconductor, Inc.
4 7
REHS
0000_0000_0000_0000
0x11304 (FPSMR1), 0x11324 (FPSMR2), 0x11344(FPSMR3)
20 21 22 23
— TSIZE RSIZE UPRM UPLM RUMP HECI HECC COS
0000_0000_0000_0000
0x11306 (FPSMR1), 0x11326 (FPSMR2), 0x11346 (FPSMR3)
1
there is no extra header support for User defined cells so these bits should be
1
there is no extra header support for User defined cells so these bits should be
1
It is recommended to program ICD=1 so that idle cells will not be discarded.
MPC8280 PowerQUICC II Family Reference Manual
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8 9 10 11
ICD TUMS RUMS
R/W
24 25 26 27
R/W
Description
15
LAST PHY/PHY ID
28 29 30 31
1
)
1
)
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