TMPR4956C datasheet(202/286 Pages) TOSHIBA

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Chapter 11 TX4956 System Interface

11-34

11.3 System Interface of R4300 Type Protocol Mode

Note: This mode is available for TX4956 with 32-bit bus width

In TX4956, it is built in system interface function corresponding to R4300 type protocol. A selection of

above-mentioned R5000 type protocol mode or R4300 type protocol mode increases by external pin

(MODE43* :Pin No. B15).

The R4300 type protocol mode setting is as follows:

BSIZE64*=0

MODE43* = 0

Note:

In R4300 type protocol mode of TX4956, there is not PReq output signal. Therefore PReq

input signal of an external agent should be always fixed in “Low”. And also there is not a

function to show that protocol errors were detected. Otherwise, TX4956 has a built-in counter,

and when there is no reply detected to read request in a certain time, bus error exception

occurs.

11.3.1

System Interface Description of R4300 Type Protocol Mode

The TX4956 processor has a 32-bit address/data interface. The System interface consists of:

•

32-bit address and data bus, SysAD

•

5-bit command bus, SysCmd

•

five handshake signals:

– EValid*, PValid*

– EReq*

– PMaster*, EOK*

Table 11.3.1 System Interface Signals (When R4300 type protocol mode (MODE43* = 0, BSIZE64*=0))

Signal Name

Pin No.

I/O

Function

SysAD[63:32]

B5, B6, B7,

B8, B9, B10,

B11, B12,

B13, B14,

E14, F14,

G14, H14,

J14, K14,

L14, M14,

N14, P14,

P13, P4, P3,

N2, M2, L2,

K2, J2, E2,

D2, C2, B2

I/O

Reserved

These pins are always driven to 0, then, can be left open on the board

SysAD[31:0]

A10, A11,

A12, A13,

C15, D15,

E15, F15,

G15, H15,

J15, K15,

L15, M15,

N15, P15,

L1, K1, J1,

H2, H1, G2,

G1, F2, F1,

E1, D1, C1,

A6, A7, A8,

I/O

System address/data bus

A 32-bit address and data bus for communication between the processor and an

external agent.

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