peb3456e Infineon Technologies Corporation, peb3456e Datasheet - Page 122
![no-image](/images/no-image-200.jpg)
peb3456e
Manufacturer Part Number
peb3456e
Description
Channelized T3 Termination, With Ds3 Framer, M13 Multiplexer, T1/e1 Framers And 256-channel Hdlc/ppp Controller
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB3456E.pdf
(424 pages)
- Current page: 122 of 424
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Figure 4-16 Mailbox Structure
Alternately, consider when an intelligent peripheral connected to the local bus wants to
transfer data to the PCI host system. First it loads data into the mailbox data registers
MBE2P1 through MBE2P7 and then it writes status information to the mailbox status
register MBE2P0. This causes a system interrupt vector to be written to the PCI host
system, indicating that valid data is contained in the mailbox data registers.
This interrupt vector will be written to the interrupt queue specified in CONF1.SYSQ and
together with this the pin INTA will be asserted. The processor sees the interrupt pin
asserted, reads the register GISTA in order to determine the interrupt queue, and then
writes a ‘1’ to the interrupt status acknowledge register GIACK to clear the interrupt.
Next, it reads the interrupt vector which contains a copy of the mailbox status register
and then reads the mailbox data registers.
4.13
Since the TE3-CHATT is divided into the basic functions mailbox, layer one functions
(T1/E1 framer, facility data link, M13 multiplexer and DS2/DS3 framer) and layer two
protocol functions (HDLC, PPP, TMA), the same partitioning is used for the interrupt
handling.
All layer two interrupts (channel, port, system and command interrupts) are handled via
an internal interrupt controller which forwards those interrupts to external interrupt
queues. This interrupt controller is connected to the PCI interrupt pin INTA.
Data Sheet
Interrupt Controller
Interrupt Controller
PCI Interface
PCI Side
Interrupt Vector
read
only
MBP2E1..MBP2E7
MBE2P1..MBE2P7
PCI --> Local Bus
Local Bus --> PCI
Mailbox registers
Mailbox registers
MBP2E0
MBE2P0
122
read
only
Interrupt Vector
Local Bus Interface
Interrupt Controller
Functional Description
Local Bus
PEB 3456 E
05.2001
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