PSD4235G2 datasheet(9/93 Pages) STMICROELECTRONICS

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PSD4000

Architectural

Overview

(cont.)

4.5 ISP via JTAG Port

In-System Programming can be performed through the JTAG pins on Port E. This serial

interface allows complete programming of the entire PSD4000 device. A blank device can

be completely programmed. The JTAG signals (TMS, TCK, TSTAT, TERR, TDI, TDO) can

be multiplexed with other functions on Port E. Table 3 indicates the JTAG signals pin

assignments.

4.6 In-System Programming (ISP)

Using the JTAG signals on Port E, the entire PSD4000 (memory, logic, configuration)

device can be programmed or erased without the use of the microcontroller.

Port E Pins

JTAG Signal

PE0

TMS

PE1

TCK

PE2

TDI

PE3

TDO

PE4

TSTAT

PE5

TERR

Table 3. JTAG Signals on Port E

PSD4000 Series

Preliminary Information

4.7 In-Application re-Programming (IAP)

The main Flash memory can also be programmed in-system by the microcontroller

executing the programming algorithms out of the secondary Flash memory, or SRAM.

Since this is a sizable separate block, the application can also continue to operate. The

secondary Flash boot memory can be programmed the same way by executing out of the

main Flash memory. Table 4 indicates which programming methods can program different

functional blocks of the PSD4000.

Device

Functional Block

JTAG-ISP

Programmer

IAP

Main Flash memory

Yes

Flash Boot memory

Yes

PLD Array (DPLD and GPLD)

Yes

PSD Configuration

Yes

Table 4. Methods of Programming Different Functional Blocks of the PSD4000

4.8 Page Register

The eight-bit Page Register expands the address range of the microcontroller by up to

256 times.The paged address can be used as part of the address space to access

external memory and peripherals or internal memory and I/O. The Page Register can also

be used to change the address mapping of blocks of Flash memory into different memory

spaces for IAP.

4.9 Power Management Unit

The Power Management Unit (PMU) in the PSD4000 gives the user control of the

power consumption on selected functional blocks based on system requirements. The

PMU includes an Automatic Power Down unit (APD) that will turn off device functions due

to microcontroller inactivity. The APD unit has a Power Down Mode that helps reduce

power consumption.

The PSD4000 also has some bits that are configured at run-time by the MCU to reduce

power consumption of the GPLD. The turbo bit in the PMMR0 register can be turned off

and the GPLD will latch its outputs and go to standby until the next transition on its inputs.

Additionally, bits in the PMMR2 register can be set by the MCU to block signals from

entering the GPLD to reduce power consumption. See section 9.5.

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