MK50H25 Datasheet, PDF (21/64 Pages) STMicroelectronics – HIGH SPEED LINK LEVEL CONTROLLER

MK50H25
of the XID command is located in the XID/TEST Receive buffer.
Valid only if XIDE bit in CSR2 is set.
11
XID Confirmation: Indicates the receipt of an XID response. The data
field of the XID command is located in the XID/TEST Receive buffer.
Valid only if XIDE bit in CSR2 is set.
12
TEST Indication: Indicates the receipt of TEST command. The data field
of the TEST command is located in the XID/TEST Receive buffer.
13
TEST Confirmation: Indicates the receipt of an TEST response. The data
field of the XID command is located in the XID/TEST Receive buffer.
Valid only if XIDE bit in CSR2 is set.
14
Disconnect Indication: Indicates request by the remote station to disconnect
the current logical link (DISC received), or the refusal of a previous
Connect or Reset Request. The chip is now in the Disconnected
phase.
15
Disconnect Confirmation: Indicates the completion of a previously
requested link disconnection.
4.1.2.3 Control and Status Register 2 (CSR2)
RAP<3:1> = 2
1111110000000000
5432109876543210
CE F T _XP
X
Y
C
I
B
R2
M0
7
5
R
O
U
I
I
D
L E R 3 _EM E _E
ENDE
IADR<23:16>
BIT NAME
15 CYCLE
14 EIBEN
13 FRMRD
12 T203E
11 X75E
10 PROM
9
UIE
8
XIDE
DESCRIPTION
Setting this bit selects a shorter DMA cycle (5 vs 6 SYSCLKs for bursting
or 5 vs 7 SYSCLKs for single DMA). See Figures 7a and 8a for details.
Extended Initialization Block Enable. Setting this bit will cause the
MK50H25 to use an extended Initialization Block which uses all of
IADR+08 as a 16-bit scaler, moves N2 to the upper byte of IADR+40,
and extends the Init Block past IADR+55. This bit is READ/WRITE.
Setting this bit disables the sending of FRMR frames (used for LAPD
applications); otherwise the MK50H25 behaves as specified for X.25.
This bit is READ/WRITE.
If this bit is set, the T3 timer is reconfigured to behave as specified for
LAPD T203 timer; otherwise it behaves as specified for X.25. The op-
eration of the T203 timer is that it expires after T203 time of not having
received any type of frame, and causes a RR/P=1 polling (Timer Re-
covery) procedure to begin. This bit is READ/WRITE.
X.75 mode of protocol operation is enabled if this bit is set to 1;
otherwise X.25 mode is enabled. This bit is READ/WRITE.
Address filtering is disabled for Transparent Mode if this bit is set. All
uncorrupted incomming frames are placed in the Receive Descriptor
Ring. This bit is READ/WRITE and should be set only in Transparent
Mode.
UI frames are recognized only if this bit is set. If UIE=0 all received UI
frames will not be recognized. This bit is READ/WRITE.
XID frames are recognized only if this bit is set. If XIDE=0 all received
XID frames will not be recognized. This bit is READ/WRITE.
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